Originally Posted by fastauto
Thanks for the response. I come from a life of larger turbo cars and know they can be a issue. From all of my reading about this engine and tunes, it looks like most of the people that use the car for TT or other track related events run your stage 2 tune and sometimes meth and have no problems. What supporting mods are needed to run a stage 2 tune? downpipes? upgraded ic? Thanks
For the 1M, Stage 2 only requires an upgraded intake and intercooler. We found that the factory downpipes aren't as restrictive as they are on the other N54 equipped cars. We do have a Stage 2 file for those wishing to utilize upgraded downpipes, but it is not a requirement for this Stage.
Berk Technology and Evolution Racewerks both run water-methanol injection on their 135i's. They are running our Stage 2 file, with the optional "Race" file (for 100 octane or 91/93 with 50/50 water-methanol injection).