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If you have E85 in your area, all you would need to add to your list of mods to reach 550 wheel HP is a Walbro 485 fuel pump and E85 tuning.
The single Walbro 485 pump supports 600 Wheel HP on E85, your 740cc injectors will support 550 wheel HP and would be what limits higher than 550 wheel safe power.
To go higher than 550 you would need larger injectors and that requires different fuel rails.
The amount of power over 550 with your turbos would not be significant with stock heads and cams to warrant changing the injectors.
Doing head work and cams would offer a better overall power band for either fuel, but simply switching fuels and adding a pump would offer the largest gains.A number of ways to run E85 as a flex fuel that allows any mix of pump fuel and E85, if that interests you feel free to call or email for more info.
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16:08:17 06/22/15
