Interesting, so the CTR comes with 2.25" diameter for the exhaust??

[02SilverSiHB]

I was on this site and noticed that the b-pipe and muffler (not surprised about the muffler) is at 2.25" diameter.
Just thought I'd share
http://www.aj-racing.com/spoon-sports/ep3-inex.html

[JSIR]

I remember chatting with a UK CTR owner and his exhaust system was slightly bigger than ours at the midpipe but slightly smaller piping on the muffler, I found it very strange, but he verified it for me several times as did others on the UK Honda CTR forum.

The North American RSX-S uses a 2 inch midpipe, not sure on the muffler but I suspect it is about the same. The UK CTR has the same engine as the NA RSX-S so I thought they would use the same muffler exhaust combo. but all three exhausts are slightly different between the UK CTR, NA Civic Si, NA RSX-S. Maybe the JDM CTR is different altogether .