eh. Is all I can say. I like the sound at idle from the rear, but its a bit too loud in the car, and doesn't sound quite right in the cabin. It sound sick when I'm on it. BUT I think it leaned the car out. I think it sounds like it's pinging, or maybe that's the 'trumpet' sound you guys are talking about. It is a very low volume kinda of a ticking/hollow noise when it's idling. I am running a C&L 87 tune, and the Roush axle-back is actually maganflows with roush stamped on them. Anyone think it could be leaning out? Should I bump up to a higher octane fuel?