Quote:
Originally Posted by Irace86.2.0
And another.
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Yes, those charts are with HBP (+E85+header). That is why higher rpm range torque is not flat anymore. And that is probably where engine reinforcements are now necessary. The link I have given above shows the same thing. See yellow dotted line (stock pulley) vs yellow continuous line (high-boost pulley)
Vittuned claims it is fine to use HBP with the stock engine in that link but I would not try myself or recommend anybody else. JR does not recommend without engine reinforcement either.