I thought that the mufflers that were on my car when I bought it were flowmasters, until while pulling my trans today I notices that they say IMCO on them. I searched the net and found their website http://www.grabthepower.com/index.html. They sound good on my car. I thought they were just a flowmaster knockoff, but turns out the baffeling is completely different. I bought an x pipe and in a few weeks the windsor should be in and running,.......guess I'll see how they sound then. They sure have put alot of $$$ into their websit, that for sure!