I'm disappointed in relation to the sound of the exhaust, far from the sound heard on the product SSR performance page video, seems to me that their test Stinger had another addition in the exhaust......axle back maybe?. I liked the fact that I had a nice sound and an extra ponies gained. I have installed the drop ins K&N filters only. However, I feel a gain in engine power according to my "dynobutt" or "placebo effect", definitely. Am I the only one with this impression?