I ran a stg 2 catless with the stock catback for 2 years in san diego. left 10days before I had to do smog lol. when I got here I put the 3" catback on and went to 93 stg 2. It really opened the car. Your going to love the sf intake. the bov noise is sick. when I first installed it I went through a tank of gas in 180 miles because I wanted to hear the whoosh sound. Back to my point lol there is a guy in georgia that will drive up here and protune our cars with the cobb ap for a decent price if you ever want to go past stage 2.