So I've heard and seen people put Long tube headers on there 05-09 mustang gt with catts!?
Is that a lot of custom work? Does it knock down the power you get out of the Long tube headers if you add catts? Will it pass smog with legal catts? If so what kind of catts are they?
Is that a lot of custom work? Does it knock down the power you get out of the Long tube headers if you add catts? Will it pass smog with legal catts? If so what kind of catts are they?