What would be the power gains to the wheels with the cattman headers,rt highflow cat, and cattman catback....also i heard that since im a 2001 im cali spec and that i would have to relocate some of the o2 sensors,no big deal, my issue is i heard that i will not pass emission with the headers....Is that true.....????All feedback is very helpful, im looking to do this by august once i round up some cash..

 

I dont think you should have a problem passing emmissions if you leave your cat in place. Just make sure the car is at opperating temp. before you test.

If anything you would not pass emmissions because of the high flow cat.