Too loud for my son
I've got the GMMG on stock manifolds (headers will be here tomorrow), and I can give you some ideas of the interior sound of the car. As it sounds right now, I think it is totally acceptable on the inside. Very quiet and tame with a nice sounding hum, no resonance. I'm also keeping cats on the headers which should help equalize the sound a bit and cut the rasp... That being said, it's still going to be a lot louder once they're on.
SLP dual/dual and magnaflow are great flowing catbacks with quiet volumes at part throttle.
Jason
The Best V8 Stories One Small Block at Time
I've drivin in a car with a magnaflow, my dad owns a hooker, and i have a GMMG. I always forget how loud my car is untill i drive in my dads car, you can barley hear it at cruise but has a real nice tone at wot. The magnaflow is a bit louder then the hooker but i dont think it has as nice of a tone as the hooker does, buts its all personal preference. I wouldn't trade my GMMG, with my LT's for anything


