I would think with your PSE set to full by-pass you should get some nice sound in conjunction with the pipes.
I have a custom by-pass muffler with a much of the exhaust by-passing the muffler especially at high rpm, along with the FAB pipes.
The sound is aggressive but nice. On the throttle it has that GT-3 bark and a Ferrari burble, snap crackle off the throttle. It is loud on the throttle but quites down when you maintain throttle position. I would think the PSE would have a similar sound although it has never been quite clear to me what the actual bypass path is.
Mine doesn't let much flow into the muffler to begin with
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