2 BBl Dual Exhaust
my buddy is a smog guy in California and as of now a 1975 is exempt from smog testing so do what ever the hell you want to it just as long as it dont blow smoke or cause you to get a ticket for noise. what matters in california "smog exempt" on not. however he did state that by the "letter of the law" if you get pulled over and a cop who really wants to mess with you he can but come on now, thats probably not going to happen.