I did the same as 84_GT350 and installed all of my exhaust at once so I can't really say exactly where the Pro Chamber delivers the power most. But, I can say that I love the sound of my exhaust with the Pro Chamber and MAC flow paths. I installed long tube heads along with this system and my car seems to pull hardest around 2000RPM up to about 4500RPM and still climbs quickly to 6000RPM before it starts to fall off. It's a pretty nice piece.
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