I had a single AAM 3 inch exhaust on my BP setup. I made 532whp and 500wtq on 93 octane. Your exhaust will flow just fine for 600hp with e85. I can assure you that.
If you do some google searching, there are a lot of Supras and Skylines making over 600whp with a 3 inch single as well.
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2009 370z touring w/sports package
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