depends on what your deffinition of most hp. slp twin pipes have huge gains/claims. but have had a lot of bad luck with there big gains lately. the aaen have the biggest wieght loss and you never see a post of people saying there aaen pipe is junk.
after my experience of slp lately. I would go aaen without a second thought. plus I can give more price cuts on the aaen than slp.
I don't think you could go wrong with either SLP or AAEN pipes the horsepower specs are similiar.
Boils down to personal preferance.
Watch E-Bay I got a SLP pipe and can for $275 this included shipping.the set up was in great shape and by looking at it not used for very long.
any one hear anything about LRM? my friend had slp's on his ultra and LRM pipes gave it more power. SLP pipes are pretty common... my uncle used to have a set of twin slp pipes so i was really looking for somthing a bit different.
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