slip on pipes?

:confused: Does anyone know of any good tests on on slip on pipes, so i can tell the hp differnces and stuff like this. If so please tell me were at so i can check it out. Thanks.

[stocktires]

I dont believe anyone did a test on just slip ons, but they included slip ons in the tests!
I believe the TC slip on produces the most power from the tests I've seen. But Its LOUD