hp in stock blaster

Thats what i was thinking, how much more would be added with an exhaust system installed as mine has a full fmf system and open air box
 
PEAK hp? Probably 3-5 hp. The trick with a well designed pipe is that it doesn't raise peak hp by very much (it increases torque and upper rpm a bit) but it provides a better "midrange" and smooths out power delivery across the board.