Brian wrote:Just for you Chuck!
I know you are into the math on exhaust pipe sizing, tell me what you think here. The sprung connection that was formerly on the NC header outlet and is now moved downstream to muffler inlet means even more folks get the challenge of dealing with that on install since now even a muffler change means working with that sprung connection.
That's kind of an odd size. 2.1075" comes out to 53.5mm. I wasn't able to quickly find a source on-line for 53mm exhaust tubing, but there do seem to be a number of 52.5-53.5mm gaskets, flanges, etc., so it must not be too unusual a size for Japanese cars. Seems to be used on some Honda models as well.
That seems under-sized for the 2.0L model, as it just barely supports the factory hp rating. Assuming that it's 16 gauge tubing, it's going to be basically zero-restriction up to 161 hp, and gradually becomes more restrictive as power grows from there. I can all but guarantee that they make the jump to 60mm piping on the Cup cars, if they're going to have them tuned up closer to 200 hp.
You could probably get away with a nice 2-1/4" exhaust setup on this car, if keeping weight down is a priority, and still have a bit more tuning headroom than the factory exhaust. Of course, 2-1/2 would probably be easier, as there are more parts available, and you may even be able to re-use some of the components designed for the NC, like the mid-pipe resonator, and maybe even the Race and Street singles with slightly different piping on them.