Originally Posted by CXTKRS1
I have been hearing roughly 4-6 HP is expected from an axle back, I have not seen any dynographs to back that up however.
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yup i've been hearing the same thing and if thats the case there really is no point in getting a cat-back cus the xd will probably just gain maybe an extra 1-2 hp if that. im not beat to spend an xtra 150 bucks to just add 2hp