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FWIW to the OP. I did exactly what you're looking to do. However I am running a smaller pulley on a p1 though in addition to the headers, etc.
I was tuned for E60 but my highside is just starting to dip so to be safe I dropped it down to E55 or less but nothing but positives though!. What a huge difference e85 makes even just normal driving.
Also you may want to consider running off road pipes unless you absolutely need the cats.
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Former Ride: 17 Camaro 2SS, M6 - Fifty | Procharger P1SC | 3.7 Pulley | Stage 2 IC | Race Bypass | DSX FF Kit | JRE Custom E85 Flex Fuel Tune | LT4 Fuel System | JMS Voltage Booster | MSD Plug Wires | American Racing 1-7/8's LT Headers Full System Catback | Baro Breakout Harness | LT4 Map Sensor | Katech Ported TB | MMS Oil Catch Can | 160 Thermo | Solo Performance J-Pipes

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