666 PERFORMANCE

TERMS AND CONDITIONS

Revision: 1.0

Effective date: 15 September 2026

1 ABOUT US

1.1 We are 666 Performance.

1.2 You can contact us by email at info@666performance.co.uk.

1.3 If we need to contact you, we will normally do so by telephone, email or postal address provided by you when making a booking or placing an order.

1.4 "Writing" and "written" include email communications.

2 THESE TERMS

2.1 These terms apply to services, digital products and physical products supplied by 666 Performance and to work carried out by 666 Performance on a vehicle.

2.2 Please read these terms carefully. They contain important information about the service, the condition and suitability of your vehicle, tuning risks, payment, refunds, complaints and liability.

2.3 By accepting these terms and authorising us to proceed, you confirm that you have had a reasonable opportunity to read them and understand the important risks relevant to the work you have requested.

2.4 The revision number and effective date shown at the top of these terms identify the version applicable to your acceptance. We may amend these terms from time to time. The revision in force when you accept the terms applies to that service unless a later change is required by law or separately agreed with you.

2.5 We will keep an electronic record of accepted terms where you complete our online declaration. Your agreement record may include your name, email address, vehicle registration, date/time of acceptance, terms revision, terms hash and the exact terms accepted.

2.6 These terms do not remove or reduce any consumer rights or other liability that cannot legally be excluded or restricted.

3 AUTHORISATION, VEHICLE OWNERSHIP AND CUSTOMER INFORMATION

3.1 You confirm that you are the registered keeper, owner or authorised representative of the owner of the vehicle, and that you have authority to instruct us to carry out the requested work.

3.2 You must provide accurate information about the vehicle and disclose any known faults, warning lights, previous tuning, tuning boxes, ECU/TCU modifications, mechanical modifications, aftermarket parts, accident damage, water damage, electrical problems and other information which may reasonably affect the work.

3.3 If you fail to disclose relevant information, we may decline to proceed, stop work, or charge for time and expenses already incurred, subject to your statutory rights.

3.4 You remain responsible for the accuracy of information supplied to us and for ensuring that the vehicle is legally and safely available for the requested work.

4 VEHICLE CONDITION AND DIAGNOSTIC CHECKS

4.1 Where reasonably practicable, we may carry out a diagnostic scan before commencing work. A diagnostic scan is not a full mechanical inspection, roadworthiness inspection, MOT test, engine health check or guarantee that the vehicle is mechanically sound.

4.2 A vehicle may contain defects or weaknesses which are not detectable by a diagnostic scan or which do not produce a diagnostic fault code.

4.3 We may refuse or postpone work where we reasonably believe that the vehicle is unsuitable, unsafe or likely to be damaged by the requested work. If this happens, our applicable call-out, travel or labour charges may still apply where permitted and where those charges were disclosed/agreed.

4.4 If we identify a fault and advise you not to proceed, you should not instruct us to proceed against that advice without understanding that the underlying condition may affect the outcome. Any separate written authorisation to proceed will be retained as part of the job record.

5 ECU PROGRAMMING AND ELECTRONIC RISKS

5.1 ECU/TCU programming involves electronic communication with vehicle control modules and carries inherent technical risks.

5.2 Possible risks include communication failure, interrupted programming, battery/voltage failure, ECU recovery requirements, incompatible or previously altered software, ECU hardware failure and, in exceptional circumstances, the vehicle becoming temporarily inoperable.

5.3 We will carry out programming with reasonable care and skill. However, no responsible tuning business can guarantee that an ECU or vehicle which is already defective, unstable, previously modified or electrically compromised will tolerate programming.

5.4 You are responsible for ensuring that the vehicle has a sufficiently charged and serviceable battery and a functioning charging system unless we have expressly agreed otherwise.

5.5 If programming cannot be completed or the vehicle requires recovery/reprogramming, we will take reasonable steps to restore or recover the vehicle where that is technically possible. Additional labour, recovery or third-party charges may apply where the underlying cause is not due to our failure to exercise reasonable care and skill.

5.6 You must contact us promptly if you experience a problem which you believe is connected with our work and, subject to safety, give us a reasonable opportunity to inspect and investigate before another person overwrites, alters, repairs or removes the relevant software.

6 PERFORMANCE TUNING AND VEHICLE WEAR

6.1 ECU calibration may alter engine power, torque, throttle response, boost, fuelling, ignition, torque limits or other operating characteristics depending on the service supplied.

6.2 Increasing power and/or torque can place additional load on the engine, turbocharger(s), clutch, flywheel, gearbox, driveshafts, differentials, fuel system, cooling system, emissions components and other parts.

6.3 Increased load can expose pre-existing wear or weaknesses and may accelerate normal wear of components which were already worn, damaged or operating close to their design limits.

6.4 A vehicle failure occurring after tuning is not, by itself, proof that the tuning caused the failure. Where a technical dispute arises, the cause should be assessed using appropriate diagnostic and engineering evidence.

6.5 We do not guarantee that a vehicle will tolerate a particular power or torque increase, particularly where the vehicle has high mileage, poor maintenance, previous modifications, known faults or components with limited remaining service life.

6.6 Stage 1 calibrations are generally intended for vehicles retaining their standard mechanical specification. You must disclose any modifications or previous tuning before we begin.

6.7 Where a bespoke calibration is requested for a mechanically modified vehicle, you remain responsible for ensuring that the hardware is suitable, correctly installed and appropriately maintained for the intended power level.

7 POWER, TORQUE AND FUEL ECONOMY FIGURES

7.1 Any quoted power and torque figures are estimates unless a specific measured result from an agreed dyno test is expressly provided.

7.2 Results vary according to vehicle condition, mileage, fuel quality, ambient conditions, dyno methodology, modifications, maintenance and other factors.

7.3 Fuel economy is affected by driving style, traffic, load, tyres, temperature, maintenance, fuel, journey type and many other variables. No fuel-economy improvement is guaranteed.

8 SOFTWARE, ORIGINAL FILES AND SOFTWARE STABILITY

8.1 Where technically possible, we may retain a copy of the original ECU data and the modified data associated with the vehicle.

8.2 If a manufacturer or third party later overwrites modified software during servicing, diagnostics or an ECU update, we may be able to restore the supplied calibration. Our standard call-out and labour charges may apply unless the restoration is covered by a separate warranty or service commitment.

8.3 Our software stability commitment relates to the stability of the calibration supplied by us. It does not guarantee against ECU hardware failure, vehicle electrical faults, manufacturer updates, third-party intervention, corrupted data, mechanical failure or changes made by another person.

8.4 No third party may alter, copy, extract, distribute or redistribute our supplied calibration except where permitted by law or expressly authorised by us.

8.5 If the supplied software is altered or overwritten by a third party, we may be unable to provide a software-related refund or warranty service until the vehicle has been inspected and the circumstances established.

9 EMISSIONS, ROAD USE AND LEGAL COMPLIANCE

9.1 666 Performance will not knowingly authorise or encourage the use of a vehicle on a public road in a condition that is unlawful.

9.2 Modifications to DPF, GPF, EGR, SCR/AdBlue, catalytic converters or other emissions-control systems can affect whether a vehicle complies with applicable emissions and road-use requirements.

9.3 Where a customer requests work for a competition, motorsport, off-road, export or other lawful non-road application, the customer is responsible for ensuring that the vehicle is used only in circumstances where the resulting configuration is lawful.

9.4 The customer is responsible for understanding and complying with the laws applicable to the vehicle's intended use. Nothing in these terms authorises unlawful road use.

9.5 We reserve the right to refuse work which we reasonably believe would facilitate unlawful use or would put us at risk of breaching applicable law.

10 INSURANCE, WARRANTY AND MAINTENANCE

10.1 You are responsible for notifying your motor insurer of modifications where required by your policy or applicable law and for ensuring that you have appropriate insurance.

10.2 ECU tuning and other modifications may affect a manufacturer's warranty. You are responsible for checking the warranty implications before authorising work.

10.3 You remain responsible for servicing and maintaining the vehicle in accordance with the manufacturer's requirements or other appropriate maintenance schedule.

10.4 You must not operate the vehicle in a manner that is unsafe, abusive or inappropriate for its condition or specification.

11 PAYMENT AND FEES

11.1 We accept payment by the methods stated at the time of booking or purchase.

11.2 Payment may be taken before work, at the time of booking, on completion of work, or at another agreed time.

11.3 Our standard call-out and labour fee is currently £60 call-out plus £40 per hour labour, unless a different price has been agreed in advance.

11.4 Where work cannot be completed because the vehicle is unsuitable, has been previously modified, contains incompatible software, cannot communicate with the required control module, or for another reason outside our reasonable control, applicable disclosed call-out, travel and labour charges may apply.

11.5 Additional work outside the originally agreed scope will normally be discussed with you before it is undertaken, unless immediate action is reasonably necessary to protect the vehicle or complete the agreed service.

12 REFUNDS, SOFTWARE ISSUES AND CUSTOMER REMEDIES

12.1 We offer a 14-day satisfaction policy as an additional commercial policy. It does not replace or restrict any statutory consumer rights.

12.2 If, within 14 days of the service, you are unhappy with the service for a reason covered by our satisfaction policy, we may offer a partial refund and restoration of the original software, subject to the conditions explained at the time of booking and subject always to your statutory rights.

12.3 If you report a fault which you believe was caused by our work, contact us promptly and give us a reasonable opportunity to inspect and diagnose the issue.

12.4 Where investigation establishes that a fault was caused by a defect in our service or software for which we are legally responsible, we will provide the remedy required by law and/or any additional remedy we have expressly offered.

12.5 We are not responsible for failures caused by pre-existing defects, normal wear and tear, poor maintenance, undisclosed modifications, misuse, third-party alterations, unrelated mechanical/electrical faults or other circumstances not caused by our breach of contract or negligence, subject to your statutory rights.

12.6 If our supplied software has been deliberately altered, copied, tampered with or overwritten by a third party, this may affect our ability to provide our commercial software warranty or satisfaction policy.

12.7 Nothing in this section removes any statutory repair, repeat-performance, price-reduction, refund or other remedy which applies to you by law.

13 COMPLAINTS AND INVESTIGATION

13.1 If you have a complaint, please contact us at info@666performance.co.uk as soon as reasonably practicable and explain the issue.

13.2 We will make reasonable efforts to investigate complaints promptly and fairly.

13.3 Where a complaint concerns vehicle damage or software performance, you should, where reasonably possible, allow us to inspect the vehicle and relevant ECU data before another business carries out work that could alter the evidence.

13.4 This does not prevent you from taking reasonable steps where necessary to protect your safety, prevent further damage or comply with legal requirements.

13.5 If an independent technical assessment is reasonably required to determine causation, the parties should discuss an appropriate independent assessor before incurring substantial expert costs.

14 OUR LIABILITY

14.1 We will provide our services with reasonable care and skill as required by applicable law.

14.2 Nothing in these terms excludes or restricts liability for death or personal injury caused by negligence, fraud or fraudulent misrepresentation, or any other liability which cannot lawfully be excluded or restricted.

14.3 We are not responsible for loss or damage which was not caused by our breach of contract or negligence, including loss arising solely from a pre-existing vehicle defect, normal wear and tear, undisclosed modifications, third-party work, misuse, inadequate maintenance or circumstances outside our reasonable control.

14.4 We are not responsible for indirect or consequential losses which were not reasonably foreseeable when the contract was made, subject to any liability which cannot lawfully be excluded or restricted.

14.5 Nothing in these terms prevents you from relying on any statutory right or remedy available to you.

15 INTELLECTUAL PROPERTY

15.1 Software, calibration files, maps, tuning data, documentation and other materials supplied by 666 Performance may be protected by intellectual property rights.

15.2 We grant you a limited right to use the supplied calibration for the vehicle for which it was supplied, subject to these terms.

15.3 You must not knowingly copy, sell, distribute, extract, reverse engineer, publish or provide our proprietary calibration files to another person except where permitted by law or with our written permission.

15.4 Where a vehicle is sold, the calibration may remain installed in that vehicle. The purchaser does not automatically acquire a right to extract or redistribute our calibration file.

16 RECORDS AND DATA

16.1 We may retain records reasonably required to provide, support, verify and administer our services, including customer details, vehicle registration/VIN, mileage, diagnostic information, ECU file identifiers, photographs where taken, communications and accepted terms.

16.2 Accepted online declarations may be retained with the terms revision, acceptance date/time, agreement reference and SHA-256 hash of the accepted terms.

16.3 Personal information will be handled in accordance with our Privacy Policy and applicable data-protection law.

17 CHANGES TO THESE TERMS

17.1 We may update these terms from time to time.

17.2 Each published revision will have a revision number and effective date.

17.3 A customer acceptance record relates to the exact revision accepted at the time. A later revision does not retrospectively alter the wording accepted by an earlier customer.

18 GENERAL TERMS

18.1 No person other than a party to the contract has a right to enforce any term of the contract under the Contracts (Rights of Third Parties) Act 1999, except where expressly stated otherwise.

18.2 You may not transfer your contractual rights or obligations without our prior written consent where the law permits us to require this.

18.3 If any provision is found to be illegal, invalid or unenforceable, the remaining provisions will continue to apply.

18.4 If we do not immediately enforce a right under these terms, that does not mean that we have waived that right.

18.5 These terms are governed by the laws of England and Wales, subject to any mandatory consumer protections that apply to you.

19 CUSTOMER DECLARATION

By submitting the online declaration, you confirm:

"I confirm that I have read and understood the 666 Performance Terms and Conditions, including the Key Points and any warnings relevant to the work requested. I confirm that the information I have provided about myself and the vehicle is accurate to the best of my knowledge. I understand that vehicle tuning and ECU programming carry technical and mechanical risks, and I agree to the applicable terms for the service I have requested. I understand that this declaration does not remove any statutory rights or liability that cannot lawfully be excluded or restricted."

END OF TERMS AND CONDITIONS