Like GT Premi said, pulley for pulley and fuel for fuel a new revision twin screw 2.8/2.9 kills the TVS 2300. If your mechanic is having success with the KB 2.8, why not listen to his recommendation? I have a gen 2 TVS myself, I like it, but I don't try to pretend it is more than it is.
Probably because he said he wants to stay on 93octane pump gas. Good luck pushing 20 plus pounds of boost on that.
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