Has anyone tried these? Wonder how they sound. http://www.amazon.com/gp/product/B000A8MSJI/qid=1142365064/sr=1-15/ref=sr_1_15/002-1102283-5350442?%5Fencoding=UTF8&m=A1MK3HAFHEKCQU&s=automotive&v=glance&n=15684181

racemufflers.com or racemuffler.com

Here's some more that look interesting:

http://www.grabthepower.com/pro-mufflers.html
http://www.forceautomotive.com/mufflers.htm

If I ever came across the following statement in a muffler's description I'd be on my way to another muffler place:
The Pro Series muffler is a two-baffle, flow-wing design that creates maximum flow while maintaining the back pressure vital to an engine's performance.

If I ever came across the following statement in a muffler's description I'd be on my way to another muffler place:
The Pro Series muffler is a two-baffle, flow-wing design that creates maximum flow while maintaining the back pressure vital to an engine's performance.

Yeah, whatever that means. I guess I better go stuff my header collectors with aluminum foil.

We compared the Force muffler side by side with the old Flowmaster 40 series and the design is the same.

We have a pair of the Summit mufflers on our V8 Corvair. They sound and perform just like the Flowmaster in our application.