I'm wondering If I ever get y-pipe and Pulley , should it help increase more horsepower and how much would it be ? I already have Air filter on it with adapt and I dont know IF i shold get CAI which i think it is probably the same ?

 

around 15 to the wheels but you could search and find out more

 

I just did both on my car, the butt dyno says nice power increase!

 

these are two excellent mods that give the butt dyno a good feeling especially the UDP.