Definitely sounds like a misfire.. When adding lbs of boost, parts that would often need to be replaced, because they were already on their way out. Try spark plugs first. Then ignition coils. If neither of these two then high pressure fuel pump or injectors. How smooth does your car idle? If rough than you might want to clean your intake valves.
2007 BSM 335i ZSP/ZPP l JB4 G5 ISO l E85 l BMS FLASH l METH l DCI l DPs l Twin BOVs l
Scoops l 18" Forgestar F14sl Koni Yellows l Swift Spec-R l GForce Rivals/Slicks l Quaife LSD
Last edited by Exzackt; 11-27-2012 at 11:47 PM.