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another thing you have to take into consideration is compression vs. boost. boost basically raises the compression of the engine. a 10.5:1 compression engine will make more hp with 8lbs of boost compared to an 8.5:1 engine boosting 10lbs.
for ex. i have two friends, one with an itr turbo, 7lbs boost, and another with a gsr turbo, 10lbs of boost. both dynoed their cars and got almost identical charts.....240whp-type-r.....243whp-gsr.
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