Can you tell me what exhaust this is?

I'm planning on keeping the engine relatively stock so I'll look into the Toomey. I've heard from many that the Power Pros pipes work best on engines with port work or stroker kits. I don't see those in my near future so should I not go that route? I'm going to stick with the mods it already has (see sig.) and just ride it. I mostly ride in the mid to mid high rpm range on trails on my property just fyi.