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naw your stock exhaust should not be a problem, the filter i got is an 3in tyfoon airfilter, but thats going to fit on a shortram not a cold air because cold air intake normally have 2 1/4in piping, I have two shortrams custom together making it an 3in coldair intake. they are 23 bucks cant beatem for the price. you dont have aftermarket headers right? just stock header manifold? if so then theres no air being restricted. I think you have a spark plug problem.
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