I've never seen flow numbers for the Race Pro but they have a nearly identical design to Dynomax Ultraflows. I would be fairly comfortable
HP they support seems to be various claims so not sure what to believe is a limit or where it begins to be a problem. For 99% of street cars I can't even see that being an issue.
What I've seen though is good enough for me. There are Pure Stock racers running into the 12's and even 11 second zone with this system, and F.A.S.T. guys in the 10's. I've gone bottom 13's without trying hard with my own stock 400 in not so great weather conditions (12's corrected). In the future I'll likely build a stroker sleeper engine for this car that should push be in the 600hp range, but the same exhaust system will remain. I'm not worried about it.
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