if you build it, 4.2 is preferred because it's a square setup and no need to sleeve.
I don't doubt a 3.7 can hit those numbers, but it's waiting for the boost to build up that will really show. With the larger displacement, the turbo spools up quicker, that's the nice perk. Drivability will be compromised if you are waiting on the turbos.
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Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI
New Car: Under Construction
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