here is the story guys, in CT, headers are legal. And I know that you can get a lot more horse out of headers than just a hi flow cat . However, you have to replace the factory cats because the headers won't fit otherwise. I guess my question is, what would the approx. horsepower be if I just go with a hi flow cat and lets say a k&n air filter with a good cat back? And can you suggest a good hi flow cat for a reasonable price?