Aggressive tune I believe is for full stright pipe exhaust setupsI know I'm a bit late to the party but I'm loading up Bootmod3 after work tomorrow. I have a catless DP, Intake and charge pipe and drop in filter. I am waiting on my HKS catback to arrive (est time is late november ...) but I was to throw a 91 stage 2 tune on it. Anyone on the stage 2 aggresive tune with a similar set up? or should I wait for the catback before I install that tune? Ty in advance.