QtheGenius
10-31-2013, 04:58 PM
I know a lot of people with e9x 335i's that upgrade their downpipe and get a tune for a fairly descent sized power upgrade with some fuel economy benefit. Honestly, I'm not sure how this would work for the diesel, but are these upgrades available since this is also a turbo'd engine or are there other upgrades I can look at for power/fuel ecomony gains?