No need to be sceptical, moreso with our systems as I spent 6 months developing kits for the 2.0TDI Common Rail
We went out and contract hired a Leon as at the time it was the cheapest way of gaining access to the new engine.
The first kit was our CRD2+ system which controls and connects to the common rail only. This was and is a great improvement over standard which sporned our CRD-T system which connects and controls the boost pressure as well as the fuelling via the common rail.
The Leon was rolling roaded and this was the result..
Compare this graph to a well known remapper, and you will see how well the box compares
Lots of feedback from our customers on our website
: DTUK CRD-T Multi Channel Common Rail + Boost For VW Passat | Diesel Tuning UK Testimonials
My Audi A4 ALLROAD 2.0tdi With Your CRD-T | Diesel Tuning UK Testimonials
I cant vouch for other systems on the market, but as for this engine i would say we have spent a lot more time on R&D than most out of there.
Gary was one of my first customers back in 2005, since then ive sold in excess of 9500 systems so i must be doing something right
If they werent any good, i wouldnt be running about in Bluebell
As for MOT time, remove the system and the car reverts back to standard in minutes.
You can also transfer the system to 1000's of other cars, so its a win win situation