So Bought a Leo Vince Exhaust and a Two Brothers Juice Box Pro as per conversation with a sales representative at Bio Hazard. He said I should Get at least an increase of 15hp. Being an automotive technician for 26 years now, I think he is full of beans. I calculate a maximum of a 8hp - 9hp gain. I don't really care, I'm just happy to get rid of the overweight, ugly exhaust. I also would like a little more control on where I want the power and where I want to save gas. Just curious if I'm missing something in my calculations. Well is there??