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Well, ... just my opinion:
I'd say that gains could be had from a well designed set of headers + proper engine managment of it. HOWEVER, you'd mostly be shifting the torque curve around and stuff of that nature. I don't think you'd ever see any NOTABLE gains in horse power. I would agree that, particularly in my 95 1MZ's case, they're doing about the best they can NA. There is no magic part thats going to suddenly make it a 250whp motor w/o cracking it open or shoving some boost into it.
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