I just got the sport muffler from Mazda speed for my sedan and it's great, nice low sound and when you open it up it's loud but I've got a problem, in town it's fine but on the highway it's to loud, so anybody got an idea how to make not so loud in side the car.

 

you can sound dampen your car... Accumat, Dynamat, Brown Bread, wutever... It'll also help improve the sound quality of your audio system cuz stuff'll stop rattling...

 

I've got the trunk dampening on and it helps a bit but it's still to loud on highway, any other ideas.

 

slow down?? heheh. j/k..

At what rpm does it start to get too loud?

or is it just cuz it's constantly at a certain rpm so it starts to bug you? I'm considering buying this exhaust. Heard it on nelnel's car, but not on a highway.. I wasn't close enuf to his car to hear it. =)