You would know right away if it was stock, any aftermarket stock equipment such as a catalytic or even possibly a muffler wont really compare in size stock cats are humongous and mufflers are decent size as well plus on mine atleast the muffler is offset to make it harder to bypass which is why they make a special delete for my year. But it looks like what they did there is definitely put an aftermarket muffler on there which should change the sound regardless so it probably is louder but it looks like the crappy welded-in elbow there was a barn-yard mechanic attempt for making up for the offset angle the muffler would put in the system. Just a sad attempt at compensating for the pitch/angle difference must have worked though. But yeah definitely been tampered with.
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