Heat mangment, tune quality and how its driven make huge variables.
Alot of the E85 guys are at 400 without issues and FBM has torture tested their car on over 200+ dyno runs/street runs at anywhere from 300-600
Long term its hard to know, maybe they will have issues in 40k? or 10k? This question will be alot easier to anwser in 2-3 years. But at 300whp on a good tune and cooling I could see it lasting quite some time.
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