I have the GTM stage 1 twin turbo. I am running with the stock clutch and have about 7000 miles since install. As long as you aren't launching the car real hard on drag slicks then the stock clutch will hold fine.
My only supporting mods are a 34 row oil cooler, exhaust, boost gauge and AFR gauge. The kit comes with everything else.
As far as gas mileage. Not a chance to get better mileage. While the car is probably capable of getting near stock mileage there is no way you will want to drive it that way. It's way too much fun to hear the turbos spool up and that takes extra gas. I was getting about 22 mpg average per tank before the TT. I get about 18 mpg now. 4 mpg loss is a good trade for an extra 200 hp.
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