RE: [Chevelle-List] Muffler and Pipe recommendations for 67 Chevelle

[John Nasta]

Makes sense to me. Thanks Herb!   John Nasta       -----Original Message----- Actually John, the H pipe only works when the rpm and exhaust velocity are low.  Once rpm and exhaust velocity get high, the exhaust goes right past the H pipe.  An X pipe on the other hand works at all rpm for obvious reasons.