I'm in your similar boat. Looking for 400 whp with some track use but mostly mountain trips and the occasional spirited drive. I have decided on the GTM SC. I have heard great things about the reliability and driveability of the Rotrex s/c. I'm going to go this route probably next winter. It's not going to be cheap though
If you are happy with 320-340 then I would go the bolt-on tune route. That's a much more budget friendly route.
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Slightly modded
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