...where does it show a cat? do you know what a cat looks like? thats just a middle-box, silencer type thing, used in japland to control emissions/noise etc (hence why jap exhausts although cool for the brand, arent actually the best exhausts to get, well, not if you're swapping turbo's anyway). on the stock ct9 they're fine as they provide some back pressure, which the ct9 needs greatly as the wastegate is shit, but if you were to go for something bigger or a hybrid etc, nothing jdm wise will beat a custom exhaust, just because they become restrictive to meet various jap regulations etc.