On a 2003 Avalanche 5.3 with campipes, long pipes, no coils, Flowmaster FlowFX 1-into-2-out mufflers (just like Magnaflow but cheaper) sounds pretty good as a truck, deep tone, not too loud to wake up the neighbors in the morning. But when I climb in and rev it past 3500 it gets very scratchy. It almost sounds like my truck farted. I bought them to get rid of farting noises at high RPM. You did just that. No volume change, just smoothing out the sound I already had. It's worth it. As the instructions say it is 100% welded. You can't pinch them. Spring. anything is possible lol but they fall off during the drive to the muffler shop lol the flange is not designed for clamps at all.
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