is this a good set up
Unlikely to see better gains with any other catback combo.
I assume the Y pipe is TSP's? If so the cats are great for a cammed/bolt on LS1.
LM is stainlees steel and flows great for a catback.
Pacesetters are top notch peroformance wise. Being mild steel they will rust and not last forever like stianless ones though. But that's the same for all non-stainless headers.
For an ACTUAL increase in volume, his next option is a medium to large sized cam that flows more air. That'll wake his exhaust up as well.
DETROITMUSCLE had a LM, plus LTs/ORY. Once he added a small cam and ETP heads his exhaust probably tripled in volume.

be prepared to bleed from the ears though.
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