Quote:
Originally Posted by mr_desmo
soundyes but its straight thru mufflers; how can it flow more...already has what it needs ...restriction is higher up...cats and manifolds...replace that with straight longtubes and youre about done 
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Ok... yes, the stock mufflers appear to be a straight pipe BUT look at all the holes in the pipe... This is causes a lot of turbulence which is what quiets things down and reduces the flow... at least that's how it was explained to me by one very knowledgeable automotive engineer...