Does anyone know if the 3IS exhaust system lines up with the 2IS from after the header and cats? Like does the two pipes that meet with the cats after the headers match up?

 

No, the 3IS is a longer vehicle, has a different rear subframe geometry and different mounting points.

The RC is probably closer, but the subframe and mounting concerns would still exist.

Jeff

 

The rear mufflers exit tips on 3IS come out in the lower center instead of an offset that are on 2IS. The bumper will most likely get in the way If you wanted to line up exhaust tips with bumper cut outs.