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Message: <blockquote data-quote="shovel" data-source="post: 1571322" data-attributes="member: 29855">2 years ago I bought a Flowmaster Force-II catback system for my 96 V6 Mustang (converted to accept a GT catback) which came with Flowmaster 50 series mufflers instead of the Super 44's in Flowmaster's American Thunder catback.   No drone at all on that car,  it's a V6 but at ~2666rpm it would have the same number of pulses per minute as a V8 at 2000rpm.   Flowmaster discontinued the SN95 Force-II system,  maybe there's still one out there somewhere.   I was looking for one for my V8 but did not look too hard after I saw it was discontinued.The Pypes mufflers I just installed on my V8 aren't exactly zero drone but they are 90% less drone at their worst than the Flowmaster 44's were on the same car.   We all have different ears so it might be hard to describe in text exactly how a mild drone differs from just exhaust sound but it really is a difference like blowing air across the top of a large jar and even when it's a tiny drone it's still a drone.   It might not be possible to 100% eliminate it without a separate tuned resonator or J-pipes, or a quiet "turbo" muffler.My wife's Mustang may not be exactly comparable but I will say it anyway,  she has a V6 which necks both cylinder banks down to a Y and then a Magnaflow exhaust splits back with another Y to two straight-through mufflers and two exits.   The construction of the Magnaflow mufflers is very similar to the construction of the Pypes M80 mufflers included in the SFM29V exhaust on my V8.   I think overall the hardware quality and materials, welding, fit-and-finish on her Magnaflow system is all a full notch better than the Pypes set.   The closest equivalent Magnaflow exhaust to SFM29V is #15677;  I have not heard that one.Interestingly the much less expensive Pypes catback has further silencers built into the tips while the Magnaflow does not.</blockquote>