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      11-27-2012, 09:11 PM   #5
Exzackt
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Drives: n54 e92 335i/e39 540i6
Join Date: Feb 2012
Location: SF Bay

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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.
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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 10:47 PM.