From the research I've done and the handful of people I've spoken to, the 6MT's are good enough for at least 900whp... at which point you'll probably need an upgraded clutch.
You're good for 700whp with Downpipes, Tune (PP Stage 2), Exhaust, and Meth.
Anything over 750whp, you'll need turbo's... no sense in intakes till you get turbos... but that's just my opinion.
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