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They sound BAD-ASS!! Ive run them on a 72 Nova, 86 Blazer with single 3" and am currently running them behind my 388 K20. Tho they are LOUD. About as loud as straight pipes!!! Or straight pipe after a cat if you run one. Right now I run them after 2 chamber Flows. My 450 HP 388 makes some noise. So I get 40 series sound with some race car crackle!! I like it, its different. Sound like a dragster!! I have the 3" medium length...
i had a 2 in my last truck . built 400 sbc around 275 -300 hp. full headers and 2" pipes. the tubes were 30" long units. if easy on the gas not to bad at all. full throttle with load on them cover your ears. my friend asked me one time just how loud thay were. so i showed them off in town. 6-8 " snow on roads went 1 full block full throttle in 2x4 tires spinnin all the way. he said if it was summer out he would have thaut it was tractor pulls over at the fair grounds. thay just rattled his windows bad.