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not sure of how they compare to each other, but any shorty will get you maybe 5-10 hp if any, most people will suggest LT's and i suggest the same. if you are going to spend the time and money changing to headers u might as wellget LT's.
at breenspeedthey offer pypes LT headers w/catted x pipe.. dunno if it will pass emissions there or not.. woohoo i've got to love montana for something..(no emmissions tests)