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I don't know who feels safe running 500+ WHP on 91 California pump gas but I wouldn't do it no matter what turbo kit was installed. When you have that much invested in a built motor, turbo kit, and car I'm not gonna run crappy 91 octane **** water they pass for gas out here. I don't feel right putting 91 into my 380 WHP car let alone a built motor 500 HP car. And I'm sure with water/meth injection they could get a bit closer with 91 pump but still I wouldn't run it. The 91 crap out here is barely 91 as it is.