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If you were planning on pulling the Turbo and replacing the dished pistons with flat tops, the E-31 would be the better way to go. The P-90 has larger valves, and better to flow than the E-31 so you're probably better off to do some other upgrades and leave the head you have on there as is.

Bigger turbo and/or an intercooler would do more than good than anything.

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