The best money i've spent on my car, a twin channel CRTD4 box (passat 170 tdi) Pickup is smoother and it goes like a scalded cat. Mode 7 is nuts i can quite believe the quoted figures. I've settled on mode 5 for daily use. Easy to fit. Recommend it to anyone!

Just fitted the CRTD4 Triple Channel unit to my 2017 Ford Transit Custom 170. Installation wasn't too difficult however this did involve removing the air box and moving a boost pipe out of the way, firstly tried it on map 4, I felt a minor improvement over standard however I am now running on map 6 and there is a definite improvement of low down grunt. The van now pulls much harder in the low-mid range! The bhp quoted was 222bhp however I think this is slightly optimistic. I would say it feels more like 200bhp. I would definitely recommend this unit there is a definite improvement in performance. Cannot quote on fuel economy as I've only just fitted the unit. The van is now much easier and more fun to drive. The surge in 2nd 3rd and 4th is addictive! Not sure wether I will try map 7 as I have heard of tuning boxes putting some vehicles into limp mode if put on the highest setting! The customer service was also brilliant, very knowledgeable guys!

Had a tuning box fitted to my 2017 Ford Focus st tdci by these guys yesterday - Made a huge difference! Power and especially torque much improved. Great service. Very pleased thank you

TDI Tuning was recommended to me by a friend as I didn't know where to go or what to have done. These guys were friendly and knew exactly what I wanted. I now have greater / noticeable performance in my Hyundi Tucson, I'm loving the extra power. Thanks guys, good job. I would recommend these guys if anyone is thinking about it.

Thanks for the great service this morning really helpful and very informative thoroughly recommend you! Can't wait to try the system to the max.

Outstanding service They could have sold me a new system but advised me they could re program my box off my old car Thanks so much my c350 is much more fun and better to drive

I'm very pleased with the results on my Merc C250 cdi can feel the difference straight away.

Did extensive research into either remap or tuning box and decided tuning box was the way to go for my BMW F30 330d. Had a couple of companies in mind but the tdi-tuning reviews and testimonials made up my mind. I wanted something I could remove if required and left no trace. Installed my box a few days ago and the difference was immediate! Even on the recommended starting setting of 4 it was noticeably more responsive and faster! I've now worked my way up to setting number 7 and it's an animal. Up from 258bhp to 320bhp and 650nm torque. Even my digital sports dials acknowledge the difference! 100 % recommended. Thanks tdi-tuning. �

I got a 2016 BMW 330e plug in hybrid and I got the CRDT4 multi channel box for it.... And boy oh boy! What a thrilling difference! Torque and power significantly increased. I have not deared yet to put it in highest setting but the economy to mid range settings are working great! Now I have to wait and see the long term effect here in Iceland? I am planning to get another box for my next turbo charged car. Great product and the installation took about 10 minutes just as described.

Just got my BMW M5 done, felt the difference as soon as i put my foot down notice lot of difference i got my stock 552 bhp to 630 bhp and this made lot of difference. Thanks guys

Fitted one to my Audi TTS- Tdi were very helpful- transformed my car- it were already quick before but now it's so much better!- Would definitely recommend.

Instant power and fantastic MPG! Couldn't recommend any more than I already have! And p*ss easy to install!

Didn't get the young lady's name but Talbot was very helpful, no only before, but during and after the sale. Rarely you get help after a sale but they help. As for the unit, I bought the older cdtr2 unit only as my turbo sensor was hard to get too. The performance is better, especially lower gears the torque has improved, and pull off is much better in the lower gears, mpg has increased by 4-5mpg. Well done guys! just need you guys to make a unit for petrol Toyota Aygo!

Top service by Rob and Stuart at the Manchester branch, they couldn't be more helpful, would defiantly recommend TDI Tuning. The Dmax pick up pulls better and less lag off the mark.

Tbh when I purchased a tuning box I was a bit unsure about any benefits it may give to my 2004 Audi A3 2 litre TDI sport and was thinking I would fit and send it back !!! When I first fitted it the engine ran rough and I thought right it's going back !!! Up on looking around the internet though I found that on the box there is a rubber bung with a tiny screw in it ( this is not mentioned anywhere on the excellent fitting instructions though!!) so fiddled with this (after sending a email to their support team to confirm that I can do this) and what a difference !!!! The car is far smoother on pick up and a lot more urgent than it used to be and also mpg is a lot better, can't really get it below 50mpg driving it hard where before driving it normally I was getting 45ish !!! Highly recommend this product and company � One thing I am disappointed with is after I bought it (£135 posted from their site) I looked on eBay and what appears to be the same unit from their eBay shop is £79 !!!! So look there first Trev

Fitted the TDI Tuning box to my A Class A180 1.5 CDI. Wow, What a difference this box has made. The car has a lot more lower down torque and the power difference is much better too. I have been running the box on setting 5 and it's a nice mix between power & Eco. Highly recommended.

Had my 14 plate Isuzu dmax fitted with a crtd4 system from these guys today, amazing bit of kit instant difference noticeably on the acceleration in first gear all the way through and that was only on the standard setting. Well worth the money well done guys

Great service from tdi tuning, took my 318d in for a box installed and im happy with the results, very noticeable increase in mid range torque on the default setting, looking forward to ramping up to map 7 over the next few days. Was in and out in under an hour including a short test drive. Cheers guys.

Had my box fitted today at Manchester branch 5*service Buzzin I am Noticeable difference straight away #power#torque#bhp Happy defo recommend

After some problems with being sent the wrong wiring harness (an issue they have now resolved in their dispatch process) & it taking a few days to get the correct one, TDI Tuning has been very helpful and professional and followed up with great customer service. The CRDT4 Twin Channel Tuning Box on my Mazda 6 2.2d Sport is outstanding. Turbo Lag reduced and flat spots in the rev range removed. Car pulls much harder,faster and for longer when accelerating. Overall nicer to drive. Fuel economy, can't comment on yet, but as this isn't my 1st Tuning Box I'd be surprised if there was any benefit in mpg unless you drive like a nun... because let's be honest.... you don't 'really' buy these things for fuel economy do you 😆 I can say the CRDT4 from TDI Tuning is better than the Twin Channel Pro Boost Tuning Box from BlueSpark automotive it replaced in my car. It has smoother power delivery & feels like more power (both tested on default middle setting), the BlueSpark box you could feel jerkiness in acceleration as the box kicked in over certain revs - making slow round town driving a bit less comfortable. TDI's box is much smoother. It's also a better design as you can change settings with the press of a button vs taking the whole thing apart with Allen keys to change anything on Bluesparks. All in all very happy so far with the purchase !!!!