The m6 transmissions have held up under boost better than the 7at. You might want to look into and aftermarket clutch and csc but that modification is a lot less than the four grand the 7at guys will have to throw down for a built transmission.
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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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