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just curious why you're worried about running 91? at 470hp with an LSA, you can't be running that much timing. i was safely making almost 540 on 93 in my TVS LS1.
This thread is 8 years old. You might not get a response.
I ran it in my car like 10 years ago....the moment I left the gas station,...my o2's were toast lol(wot was fine, driveability not so much). We have ran it in a ton of non o2 cars though without any issues.