07863 791632 gavwarn@yahoo.co.uk

 Mon–Sat 9am – 8pm · Closed Sunday

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HomeReviews5.0 average from 9 verified reviews
# What South Wales driverssay about us.
Real feedback from real customers — daily commuters, tradespeople, farmers and enthusiasts across Merthyr, Cardiff, Swansea, Newport and everywhere between.

5.0

Average rating

From verified customer feedback across South Wales.

9+

Five-star reviews

Across Facebook, Google and direct customer feedback.

98%

Would recommend

Customers who said they'd recommend us to friends or family.

Verified customer reviews

## Straight from South Wales driveways.

 Leave a Google review

"Gavin came to the house, talked through the file before doing anything, and the car drives like a different machine. Pulls cleanly from 1,500 rpm where before you had to wait for the turbo. MPG up 4–5 on my Cardiff commute too. Proper job."

Dafydd R.

Merthyr Tydfil · 2017 Audi A4 2.0 TDI

Stage 1 Remap

"Booked through Facebook, slot within the week. Gavin diagnosed a sticky EGR first, fixed it, then did the file. No surprises, no upsell. Towing the caravan up to the Beacons is a totally different experience now."

Sarah W.

Cardiff · 2019 Skoda Kodiaq 2.0 TDI

Stage 1 Remap

"Van was going into limp mode twice a week. Gavin diagnosed root cause first — not just clearing codes — then recalibrated. Hasn't tripped once in six weeks and I'm getting 4–6 mpg more on multi-drop work. Absolute legend."

Jon E.

Swansea · 2016 Ford Transit 2.0 TDCi

Van Remap + DPF Diagnostics

"Bought the car with an intermittent EML. Gavin diagnosed the actual cause (lazy MAF, corroded EGR plug), sorted it, then remapped. Drives better than when I bought it. Took the time to explain what he did and why."

Rhys L.

Bridgend · 2014 BMW 320d Touring

Stage 1 + Engine Light Removal

"Did the job on my driveway in NP19, about 75 minutes start to finish. Road-tested it with me. Throttle response is way sharper, fuel is the same or better despite enjoying the car more. 100% reversible was the clincher."

Owen B.

Newport · 2018 VW Golf GTD

Stage 1 Remap

"Tuned for towing rather than headline numbers, which is exactly what I asked for. Pulls the horsebox up to Brecon without dropping out of fifth. Spot on."

Tom J.

Caerphilly · 2015 Toyota Hilux 3.0 D-4D

Pickup Remap

"AdBlue warnings were ruining my shift. Gavin diagnosed it properly, fixed it, then recalibrated. Hasn't beeped at me once since. Talks straight, prices fair, books quick."

Mark T.

Port Talbot · 2017 Mercedes Sprinter

Van Remap + AdBlue Diagnostics

"Wanted more low-end pull for towing the trailer up the Wye Valley. Gavin tuned for that specifically — not just chasing peak figures. Made a massive difference. Will recommend to everyone."

Eleri D.

Chepstow · 2016 Land Rover Discovery 4

Stage 1 Remap

"Old van with 180k on it. Gavin warned me what to expect, did a careful diagnostic before touching the file, then a conservative remap. MPG up, runs smoother than it has in years. Honest from start to finish."

Carwyn M.

Cwmbran · 2013 Vauxhall Vivaro 2.0 CDTi

Van Remap

Why customers come back

## Repeat work, referrals and family fleets.
A huge proportion of our work is repeat business and word-of-mouth from existing customers — second cars, partners' cars, work vans, family pickups. That only happens when people genuinely trust the result.

Every file backed up

Stock calibration archived against your ECU serial — always recoverable.

Diagnostic before calibration

We won't tune a vehicle with an underlying fault. We diagnose first, fix, then calibrate.

## Join the 9+ South Wales drivers who'd recommend us.
Send your reg and what you're after — same-day quote, same-week slot, file backed up before any change.

 Call 07863 791632Get My Free Remap Quote Leave a Google review

ECU remapping & diagnostics across South Wales. Calibrated power, sharper response, real-world MPG — done properly.

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### Services

- ECU Remapping
- Stage 1 Remap
- Stage 2 Remap
- ECU Diagnostics
- ECU Tuning
- Engine Light Removal

### Areas

- Merthyr Tydfil
- Swansea
- Cardiff
- Newport
- Chepstow
- Bridgend

### Contact

- 07863 791632
- gavwarn@yahoo.co.uk
- 35 The Birch Way, Trefechan, Merthyr Tydfil, CF48 2HA
- Mon–Sat 9am – 8pm · Closed Sunday
- Leave a Google review

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