The bolt on is much cleaner, in my opinion. It allows us ricers to throw on an aftermarket pipe with a wrench and not a torch...
The reason why slip-ons are used for all the other manufacturers is because they didn't spend the additional money to build that cool little flange into their secondary.
I just realized maybe you got your hands on a slip-on. If that is the case, and you're not scared of frankensteining your factory header, just have a shop chop off the flange and weld on the pipe for you.
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