Hi Hope this of help to someone, I have never written a review about any business or product before but I felt when credit is due I HAD to tell someone. I had my car a BMW 335d in at TRL Developments last week for some modifications and WOW what a difference. Firstly I was treated as was my car very professionally. First a diagnostic check. Then dyno run for a base figure and check everything was ok. Then the guys got to work. Removing the EGR replaced with a very nice looking stainless item then the DPF and EX CAT went in the bin again replaced with a nice bespoke st/st item. Much better than the troublesome DPF. Then back on the dyno for Matt to work his magic with the laptop writing a bespoke map. No generic plug in here. A map was written to suit My car. The results on paper looked impressive another 60 BHP!! That was more than the 50 promised you can't ask for more than that!! The only thing was it didn't prepare me for the driving experience.WOW Fast, Smooth, Responsive, Perfect!! The next shock was found on my trip to Scotland a few days later. It was this that prompted this review. Fast beyond my wildest dreams and an extra 4 MPG to boot. Problems with yr DPF get yourself down to TRL DEvelopments the best money I've had to spend on any car I've owned. I will be back again they can have all my work from now on. Top Lads!and Matt for the excellent work. read more