E85 is definitely one of the most bang for the buck mods you can do. I'm running the Fore triple setup with Deatschwerks 1500 injectors. I'm now at 698 RWHP and 741 RWTQ. Mind you, my car has no internal engine mods. I'm still considered a bolt-on car. Here's a before and after with the only change being the flex fuel setup.
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2013 ZL1 Auto Convertible - BRM
Best:
10.829@127.15
FI Interchiller, Roto-Fab CAI, Big Gulp & Res, 9.1/2.5 Pulleys, PB&S, DeatschWerks 1500cc, Fore triple pump, Pfadt LT's, RD HX, MT DR's
New times to come with E85
2016 2SS Auto - Hyper Blue Metallic
Roto-Fab CAI