I have a 2013 bmw 135 I m series and I want to increase my horsepower. If I do not use Dinan whom else could I use. I saw on the web by Bavarian motors a jb4 performance chip. What would you recommend. pjdgolf@Hotmail.com thanks.
I do not recommend JB4 have seen multiple of those kits cause issues on vehicles. If not dinan look into BMW they are making good power kits for your car.
Many options, none with which I have experience or insight for recommendations - Presumably, your 1 has the N55 engine - http://www.turnermotorsport.com/BMW-E82/c-15-bmw-engine-chips.aspx This post is almost 2 yrs. old, but may lead you to other tuning options - http://www.e90post.com/forums/showthread.php?t=494316
