These magic little boxes are worth every penny! The instant boost in power dispensed with all the low range lag of the drive and is netting me circa 10MPG extra fuel economy. Went to their unit in Chelmsford to have mine fitted and saw an instant improvement. If you're audi has been sluggish since the emissions recall has been performed on it this box will get you way over and above the performance you saw out of the factory. A**** product and service - a great company to deal with!

I looked at DTUK, RaceChip Tuning, Tuneit and yourself and after a lot and lot of reading forums, reviews speaking to people & comparing performance figures from each website I made my mind up and purchased the CRTD4 Twin Channel box, and I'm confident I made the right decision. I have drove for around 100 miles now since it arrived (Next day after ordering Tuesday afternoon) on Wednesday perfectly packaged and the instructions perfectly illustrating my cars engine. It took me literally 5 minutes to install it although it did take me a week to decide where to cable tie the box as there is no room in that engine bay for anything else it's that's tightly packed. I left the unit on mode 4 and went for a drive. The difference in power and torque was 100% noticeable from the start but I thought I could have been just wanting it to seem better so didn't get over exited. I went for a 10 mile drive on a route I used to often take and I know exactly how the car used to perform and what MPG I used to get. On the way up I admit I had a lot of fun with it and might have been a tad right foot heavy so I wasn't exactly expecting my MPG to be better I was expecting it to be worse, but on a drive that I would normal get around 41MPG I got 45.6MPG I was amazed. So on the drive home I stuck the cruise control on and left it at 70 which I would normally get around 44MPG and I got an unbelievable 51MPG I genuinely could not be happier. I have had the unit in mode 7 and it's like I have a different car altogether! (Even the MPG wasn't bad) I am now testing it in mode 1 which should be the most economical so we shall soon see. I am off to Edinburgh at the start of November and I can't wait for the drive now time to really test out the CRTD4 box. Nick

Bought a tuning box originally for my BMW 525d 2 years ago. I was impressed by both economy and performance gains. I have since changed my car twice, having the box reprogrammed for each car. I can't recommend the TDI Tuning box enough, both time the reprogramming has taken a matter of days (last time it was posted on next day delivery and delivered back to me 2 days later)

Bought a basic box for my old IDI 1.9tdi passat via ebay a few weeks back. Can confirm it does indeed work as described at a good price! Very usable extra torque low down (without a savage increase in rod mangling boost), engine does not bog any more when moving about at idle revs either, which is great for traffic. Unit feels well made and is modestly heavy for what it is - my only wonder is what the CPU in the box is actually doing? You tune it pretty much exactly the same way you would had you spliced a variable potentiometer into the plunger position signal wire, which I've done on a few old vp37's, still - for saving a few hours messing about soldering and wiring in various extras vs this box the very neat super easy to remove solution that it is I can only recommend it!