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I was only able to achieve about 550whp on a stage 2 lpfp on E30 blend. anything more than that and my lpfp would tap out, and car would misfire. Im FBO with upgraded twins. I would definitely upgrade the lpfp if your looking for 600whp. But then you would probably need PI as well to reach 600whp, because the HPFP wouldnt be able to handle that amount of power.
Me personally with a conservative daily driver tune was only able to achieve 530-550 on a E30 blend, so i doubt you would be able to do it on 91.
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