We've had Corsa, Borla, Magnaflow and a few others on our z06, every single one droned so bad at highway speeds in 6th gear you couldnt hear the radio at full volume.

Its not so much the name or the cost, its more so how the muffler is constructed and the quality/volume of the packing used.

Now on my track car, i dont care about noise/drone, i just want performance, hence the 4" turbo back straight pipe. Once I get the turbokit done on my NA, I'll probably start off with a 3.5" straight pipe and work from there