Bigmor 4 Report post Posted December 5, 2014 Hi Team, I have a 135i 2009 and considering some modifications to the N54 engine. Firstly, what would be people's advice on what I should do first? Secondly, has anyone modified one, what did you do, what were the results and how did it effect reliability? Cheers, Quote Share this post Link to post Share on other sites
handgrenade 189 Report post Posted December 5, 2014 Members here and similar examples overseas have made 400hp at the wheels with only bolt on upgrades and standard turbos. Intake, full exhaust, upgraded intercooler and a decent remap of the ecu. (Maybe a few other supporting mods I might have forgotten). In the USA people have pushed the stock block in excess of 700hp. As far as I know, the mechanical high pressure fuel pump has been holding some people back but aftermarket replacements are now making their way into the market. I'm sure some other members who have done these bolt on modifications can comment with far more detail. Quote Share this post Link to post Share on other sites
Bigmor 4 Report post Posted December 5, 2014 Thanks Ken, Quote Share this post Link to post Share on other sites
jake1829 119 Report post Posted December 6, 2014 http://bimmersport.co.nz/topic/45668-e92-335i-modification-project/?hl=335i Quote Share this post Link to post Share on other sites
