You might consider a local custom exhaust shop. It's not mandrel bent, but you're using logs. Also, I don't know the division line where you'll loose hp with crimp bent, but the majority of Pontiacs will not loose hp with a 2.5” crimped-bent systems. I have always wondered why overpriced systems don't show dyno resluts.
After a number of years of massive research on x-pipes, I went with the h-pipe. I'm not getting into a technical discussion about it, just saying what I choose.
Mine cost $300, I supplied the mufflers, and my exhaust guy said: any quieter, and it would start to plug the engine. It's a tad louder than I care for. Ultimately, I would like to hear induction only, no exhaust sound, but you cannot have everything. Just before I absolutely shredded a super, loudass 9 with ra clone engine, I watched his buddy lean toward my car, and lip “Sounds like a pussy.” So it's good enough for me because it's getting the job done.
Instead of using the supplied reducers, the guy makes his own, claiming they're dyno-documented to outflow any reducer on the market.
Two people, one who owns a Lemans, the other a 9, both had PYPES, and the systems looked like brass balls dragging on the ground, so both owners took their cars to my man for a refit.
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