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0405htp Drag 09 Z

Inside the stock muffler, one can see why it makes as much power as it does compared to an aftermarket system. It is a nearly straight-through design itself, far from your ordinary O.E.M. muffler. Remember though, that pipe going through there is definitely less than 2.5 inches in diameter and has a lot of perforations, so it does have some restriction to it.
2004 Pontiac GTO - Back in Black

 Inside the stock muffler, one can see why it makes as much power as it does compared to an aftermarket system. It is a nearly straight-through design itself, far from your ordinary O.E.M. muffler. Remember though, that pipe going through there is definitely less than 2.5 inches in diameter and has a lot of perforations, so it does have some restriction to it.  View Related Article

 

 

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