Yeah, Ex Mag is a very badass exhaust for S13, but they're about $550. My brother was on the waiting list for the initial release, but they kept pushing the release date back. He went with a Bltiz Realize TT instead. Paired with a 3" Catco cat (and 3" DP) on his SR, it's very quiet.

Both of those exhausts are 3" diameter and expensive, which is why I didn't suggest if for his NA application.