[Shane@DBPerformance]

Normally, you don't need an aftermarket FPR on any DSM, unless you have 2 fuel pumps. Tuning around a little bit of fuel pump overrun is usually not a problem.

E85 can make a little more power without doing much at all on a decent boost turbo car with upping the boos tor adding in a bunch of timing. On a turbo car, the E85 helps cool the intake charge temps like crazy, so you might get a small gain just from that, kinda like if you were running an air-to-water intercooler with ice in it. I usually see a 10whp gain on Evos when I convert them to E85 without turning up the boost tor doing much with timing. But we always turn the boost up and timing up a little from there and get a 40-50+whp gain.

E85 is not going to be of much advantage to a normal naturally aspirated car like a Corvette. You might be able to make a tiny big more power, but it isn't worth it. On a very high compression all-motor setup it is useful. It's of most use boost cars because of the octane and the cooling effect.

2G DSMs with 16Gs and the stock side mount intercooler and no timing control often start knocking above 14psi. E85 would help with cooling/knock, but it the stock SMIC is still somewhat of a flow restriction.

If you drive your car in the winter, you might need 2 different E85 tunes. The ethanol content in "E85" is much lower in the winter.

I would try some 780cc injectors and the SAFC. But you would be limited to E85. 780cc and an SAFC wouldn't work so hot on pump gas.