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380-400whp is possible on streetgas with the upcoming Procede 2.1, or Helix with IC, Catless DPs. Intake and catback might help a little, but not too much power to get now.
With 100 oct people have seen over 400whp.
However, the snails (turbos) are ACTUALLY the size of a large snail in this case, so they're really running out of steam. With stock turbos, you're much more likely to blow them up than the engine.
The stock fueling isn't good for much past 400-420whp, so it'll be a while before anyone breaks that. Direct Injection is very new, and it'll take some time to develop higher flow HPFP, fuel rail, injectors, etc.
No one really knows how much the internals can hold up to.
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'08 Black Saphire/Black Z4 M Coupe
RIP Gretta: Blue Water/Lemon 135i. Died to save me.
-ChuckV
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