The huge benefit of having a Motordyne Y pipe is it's modularity. Not only that, but the HFC is pretty boss. 3" inlets, expands to 4 inches and is only 200 cpi. It's far down stream so boosting with it is still viable. It's expensive, but it's proven.
I think the #2 would have to be the Tanabe, but it's 2.75"... I know that because my mid pipe on my Tanabe is 2.75" and irritates me because it is such. I don't see much if any power loss on a NA carwith this compared to a Motordyne straight pipe. The merge collector is well designed.
AAM's seems more like a high quality Ebay Y pipe IMO. Between that and what you have, I'd just stick with what you have.
I vote Motordyne's but I'm slightly bias. It fit perfect with my PPE's and Tanabe, and you have 3 options for sound.
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Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI
New Car: Under Construction
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