supertrap would say it in the side of the muffler body. those honestly look like a homemade set up. like a large exhaust tip welded to the pipe. like someone watch the discovery channel a bit too much, like "Paul jr is my hero". good luck and look into spark exhaust. the carry head pipes and mufflers that sound great, and my spare you a ticket and keep your neighbors from forming an angry mob.
Supertrap is very identifiable. There will be a 5 hole bolt pattern on the inside for the adjustable sound discs and will say supertrap on the canister body. They're quite brand happy. My company sells about 5 supertrap systems a month, you should see the box. Its like BLAMMO supertrap