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... but my 2 cents is you need to address what you are going to install to support larger turbo's. Intake (single or dual), inlet pipe size, exhaust system, inter-cooler size, injector size (more air needs more fuel) and tune (on dyno or just chip upgrade). The issue on 91 is combustion temp heat, with stock exhaust and intake system, larger turbos are going to generate more heat trying to get the increased air thru the system. More air being pushed thru means more fuel required (maybe over-driving stock injectors) so as to not lean the mixture. More heat + 91 = increased chance for detonation. SZ has lots of experience with getting 500hp + out of 91, send Sep a note and get his thoughts.
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