Yes it has always done this since I switched out from factory. It even done this before I installed a powercommander so I don't know. We have no dyno down where I live. I'm running a stock air filter so I'll try pulling that first then I'll try street tuning it with a sensor then I'll hear wrap it =\
just get some header wrap. the problem is the primary tubes(header) are bigger than stock and there is no room for them to fit like the stock header.
its not running lean unless your PC tune is garbage, so dont worry. if you think it is pull the plugs and look at them. if the tips are white it is lean. they should be a tan(ish) color.
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