Exactly. It's the stock Honda CBR 600F4 pipe, but it's manufactured by Yoshi.

It does sound a hell of allot better than most stock pipes in my opinion. And everyone who hears it thinks that it's an aftermarket pipe.

You can tell by the pic that it's not an aftermarket pipe; but yes, I did buy the bike used. It was fully stock with like no miles on it when I got it.

It's still stock except for an undertail kit by Eurobikes, different rear blinkers, the Targa seat cowl and a K&N air filter.