Join Date: Dec 2015
Location: Central Alabama
You can always just pulley up from the 2.7 until you're ready.
From what I read when coming to the decision to go turbo, the TVS shines the most when the car has a ported head, cams, header/downpipe, and of course E85.
Now on a 3.1 or 2.9 pulley, the car will still be stout, but you'll be limited on how much timing you can run by your fuel. More timing = more power. From what I've seen, TVS cars make the most power by dropping pulley size and revving high. Keep in mind however, that any supercharger is a parasitic drag, and the air-to-water aftercooler is no match for a air-to-air intercooler and a turbo when it comes to charge temps. Efficiency is the name of the game.
As far as exhaust, I'd at least go mid-length header/downpipe if not long tube. The catback can stay stock for now. I didn't see any dyno proven gain when I swapped from the stocker to the ZZP 2.5" catback. Also, one of the highest horsepower TVS cars had a 2.5" exhaust for a while. You don't need a sewer pipe with a supercharger like you do with a turbo.