whell, i know sts says you dont need an i/c, but i wanted to run a small one anyway, a pipe cant cool off that much. Next, the reason i did twin is because its easier. The stang has a dual exhaust. You could do a single, say like a MP t-70 or somethin with a real small a/r. but then you run into having the crossover tube near the axle, if you mount it where i mounted mine.