How much sound insulation?

[LockDoc]

Originally Posted by vectorit

I tend to believe this.
I run twin FM series 70's, and they are nice at idle.
But at highway speed, they tend to drone.

I would like to replace them with a same size muffler from Magnaflow, but it seems all they make are much smaller mufflers even if they are quieter.
Trying to avoid making my exhaust system look like a patch work of welds.

You might try the "J" pipes before you replace them. I put them on the Panel Truck with the Flowmaster 40 knockoffs and it made a lot of difference on the drone....

LockDoc