exhaust clearance is gonna depend on which SFC's you choose. The ones that simply run straight down the sides of the car shouldn't give you any problems, but the S&W set-up on my 92 Z had major clearance issues. My old 89 IROC had the competition engineering ones that just go down the sides... I'm really not that confident that it's design was worth it, although it did make jacking up the car VERY easy
The S&W SFC's while pricey, were definately worth the effort to make them fit... easy for me to say cuz my dad did all the work haha. But i think they're the best design out there, torque arm mounts right to the SFCs. they connect the rear subs to the back end of the fronts right in front of the transmission crossmember. Having a 3 inch exhaust took up all the clearance and another bend had to be made in the piping to fit. Also you lose quite a bit of ground clearance, so the crossmember for the SFC's had to be cut and rewelded to make it straighter cuz it originally has a big dip for the exhaust to pass over.
hopefully this pic will make it easier to understand. It was taken before the exhaust was finished tho...
