Fitted to my Audi TT Tdi, 3 of the 4 connections done in minutes, front of the engine more awkward. Genuinely amazed at the difference it has made; usually leave it on Tune 5, get about 7-8mpg uplift on mixed A road/motorway commute. The torque lift is the most enjoyable part of the tune as well as throttle response.

TDI Tuning provided me with a great product for my Octavia Vrs, car drives like a dream, and massive gains from standard, 242bhp to 303bhp, car pulls like a train in 3rd, 4th and 5th, well happy

Good service. Got the CRTD4 for my BMW520D for fuel economy reasons. So far I've gone from 43mpg to 50mpg, but I haven't tried all the msps yet.

Great product, great service and did exactly what was advertised. I ordered my tuning box for 2017 Audi A4 Quattro, gave me an extra 63 BHP and 8 mpg so I’m delighted. And when I change my car next year the tuning box can be reprogrammed and installed onto whatever I buy #Bonus

Great service. Arrived with everything required to fit. Very easy to do. Now getting over 5 mpg more with extra power, although I bought it for the better economy. 53mpg from my CX5. Well happy

Had the CRTD4 installed on my A45 about a month ago. I’m local to Chelmsford so had it installed by TDI. Very straightforward and took about 30 mins all in. Not really noticed a massive improvement in immediacy of throttle response when pulling away but once you get above 2000 rpm it pulls much harder than before and pulls all the way up to red line. Definitely a performance improvement over stock. Also got 35.5 mpg on a long run recently using the fuel efficiency (1 or 2) settings. The Bluetooth is really useful and worth the extra few quid. Overall very happy given the price (about £400) and flexibility this system affords. Would recommend.

Quality product.Easy to install.Best service. Nothing less *****

Cracking service with results to match.

Had my tuning box for 4 months now. The team there was great and a massive difference on my mazda 6 185. Highly recommend them

Been running it now since March 2019 on an Mercedes E250 including trips across to the Alps and Southern France. Seeing around an extra 4mpg on French autoroute speeds with it set to between level 4 and 7 with a roof box and fully loaded car, impressed. 0 - 62 is quicker although gear 2 seems a bit flat on occasions still compared to 1 & 3 in sports mode but much quicker than the 7.8ish time advertised by Mercedes and no soot out the back that I've experienced in other cars I've had chipped in the past. Seems around 6.5 secs when I've timed it from a standing start although when wet lots of wheel spin even with traction control on, but it was a torque car before adding the chip so pulls like a train now. Great expereince from the team there and would recommend, keep up the good work :-)

Really easy, friendly staff and quick service. Made a huge difference to my car, well happy.

Car pulls In dyno 155.1hp and torq 230nm OEM boost pressure 1.5bar whit the box 1.82bar max. Easy to install.

Excellent service. Took 5 minutes to connect the device & 10 mins to clip the cables so they were tidy. Car manufacturers do make it slightly difficult for TDI Tuning in as much they chop and change the equipment they use. I fitted this to a Vauxhall Grandland X. Turns out they used a Peugeot engine (part of PSA group since 2016). Bit of a nuisance as the kit had to be changed. I returned it to TDI. The return was despatched the same day and reached me the next day. Not the fault of TDI Tuning. Full marks for their service. I have previously tried another well known company, but they are not a patch on TDI for efficiency & service.

The staff are really passionate and the product is solid. Had the Bluetooth box fitted to my Audi S1 and it has really transformed the little car. The car pulls harder and revs right out rather than getting breathless. Met the director, I’m sorry I forget his name but he chatted about the car, the product, the team, a real ambassador for the company...

This is my second chip tuning box the first for my TDI VW Passat TDI 130 (to 163) the second for my Jaguar S-Type 2.7 TT Diesel from 205 to 260 BHP! A refreshing change for a company whose experts actually produce the equipment which meets their advertising specifics. The plug-play fully controllable (via BLUETOOTH) unit meets and infact exceeded my expectations. I cannot praise them enough Dyno tested and actually produced 262 at the rear wheel rather than 260 on setting 7. THAN K YOU (worth every penny)

Bought it, installed it, gave my car that bit of extra power it needed!

Octavia vrs installation diagram is incorrect. Take it to a garage with a small handed mechanic. Packs a punch. Nissan Juke nismo improved markedly. Made s slow car drivable. 120d good response. No obvious mpg saving but better power curve especially in 3rd. Easy install. Not going to make it an M5 but decent for the money. Will do for next car as well.

Really easy to install, very noticeable performance increase even on setting 1. I keep it on setting 4 which improves throttle response and turbo boost. Haven’t noticed any fuel savings but I can say it hasn’t got any worse since connecting it in but the power increase is great so happy to trade off.

Great service, tune box works well