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I have the Protreets, which are the same pipes as far as length and sound goes. They are loud! Which I like, but I also ride with earplugs. The Prostreets have better ground clearance than the firesweeps, and I have still nailed the ground with them after lowering, though I never did before lowering. I originally wanted the firesweeps, but noticed that ground clearance was going to be a problem. They are not the sweetest sounding pipe I have to admit, they are fairly harsh sounding, and they have a bit of a VW whistle that must be caused by the design of the baffle. Hope that helps!