Quote:
Originally Posted by srcstc
I thought the stock NPP with the valves open was basically a straight pipe and bypassed the stock muffler. Don't all the aftermarket axle-backs do the same thing... bypassing the mufflers when the valves are open?
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Not true! On the stock NPP the exhaust flow is still routed through the muffler, albeit a less restrictive path. Some aftermarket systems do route through straight pipe when ”open”, some don’t.