Thurs i got my magnaflow cat and friday mornin i got my cat and catback put in. i know there is a month or so breakin in period b4 the real loudness of the system comes out. sounds hella nice though way better than my old setup. I wanna go get a dyno before i do any other mod but my question is how much of a gain am I getting from my american thunder 3in catback and the magna flow high-flo cat? I can feel the gain I just dont know how much of a gain it is. Thanx in advance.

 

I'd say 15hp or so is a decent estimate.