I have a Corsa Sport free flow exhaust on my GT500. There was an annoying grinding noise that opened up from around 2300-2800 rpm and was driving me nuts. Backfires, pops and gurgles like crazy! Even cold starts were just absurd! I added one of these to every intermediate pipe after the X and now they give me a sound I can live with. The annoying squeak is almost gone. Cold starts are still noisy but are tamed almost instantly instead of being delayed like they used to be. Some pops and gurgles when decelerating are still present but at a manageable level and has a quality sound, not the crappy one it would otherwise be. The tone has also changed a bit. They've lowered the frequency response a bit and now sound a little more Mustang than smaller displacement engines, if that makes sense. looks like I've corrected my concerns about the free exhaust Corsas.
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