I found a 3rd party test showing Carsound, FLP, both stock cats, and TTS cats tested against eachother.

FLP flowed 5 cfms more than the carsound but i know they are about twice as much.. Those too were much better then the rest.

Now i saw claims that Random Tech Cats flowed 40 cfms under Carsounds.

But i did not find anything on Catco cats other than that they flow good. How good i dont know?

Right now I can pick up carsound cats for 30 bucks each 3inch in and out.

Any links to tests on cats?