im not just adding numbers up, sct has shown 30-40hp giaing from their tuning, steeda has shown 10hp gain from their intake. an axhaust should get about 15hp. all those are gained from the stock numbers. its called estimating. go ahead and do an intake exhaust and tune then get it on a dyno and try to tell me you didnt atleast gain 50-60hp from those mods.
if sct has gained 30-40 and steeda 10 from their intake then you shoulde be able to expect atleast 40 from the steeda intake and a tune.
hn155: Rockford punch pro speakers, t400.4 deh 80prs, full audio build to come. working towards 175hp n/a, simple but fun.