I have an R18. I don't think the entire catback will fit. But I'm a noob, I could be wrong. I bought a used muffler from a dude who claimed it was an SI muffler. But I think it's an EX muffler cause it sounds the same as my previous DX muffler. Eventhough it has a chrome tip.not enough posts I guess? I will sell you the entire catback. =] Doubt anyone will sell the axleback only and left the mid pipe and cat alone. Other than some people who just want the sound and look.