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Message: <blockquote data-quote="CobraRed_96_GT" data-source="post: 505717" data-attributes="member: 9107">Lots of misinformation in here. You wont make a big enough power increase with higher compression to warrant it's set-back. And you wont notice a fuel mileage difference, especially if you have to run a race gas mix on one. It really depends on your goals. If you're only going for 400-430 then you dont need forged pistons and you could work around the compression although you'll need a good intercooler and a great tune while pulling timing. Anything above that and you'll be really missing low compression. I have stage II PI heads with a stock short block right now and im at 10.3:1 compression. Stock pi heads can be about closer to 10.4:1 - but 10.3:1 is a good estimate as well. My forged .02 over shortblock is done and I used 18CC manley pistons which puts me at 9:1 compression and would hav been 8.9:1 without the boring over. 23cc manley's will put you at 8.5:1. 11CC is 9.55:1. The main thing with a high compression boosted app especially with a positive displacment is the tune, because of heat. Make sure to get IAC's down low as possible and the tune needs to be pulling timing and adding fuel everywhere to keep it from detonation. Even then i doubt 93 octane will suffice for long, although the aforementioned power goals seem within reach.</blockquote>