I hope in the end the issue with the GTM SC and after market exhausts a la long tube headers, test pipes, or HFC is because of the tune and not the inability of the SC unit to compensate for the increase in flow. I know Dreamer is working on it and I've probably mentioned this issue a million times.
It's just that to my knowledge an aftermarket exhaust should help an S/C kit granted the tubing is less than 3" in diameter. I know the reason why we haven't heard anything out of GTM is because they are still working on it, I hope they update us soon. I'm more about the "go" rather than the "show" so I'd rather get the S/C kit then wheels but I'm tempted everyday.
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2009 Carbon Fiber/Red 370z aka Trish: Sports Package, Meisterschaft full catback, Fast Intentions Longtube Headers, Injen Long Tube Intakes, UpRev Tune: Sold 
2008 Lotus Exige S Club Racer aka Bella, always leaves me smiling
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