Originally Posted by madaz

Hey guys. I'm thinking about getting the Stillen Gen 3 intake with the Fast Intentions Cat Back Exhaust with 18" resonators and generally I've been hearing a lot of people say that whatever mod you get first will give you the most power (HP) boost and and subsequent mods the boost is going to be a little less.

My question is: What happens if I get both mods at the same time? What happens then?

Thanks.