My 2005 CTS-V

[asshanson]

I'm hoping for low 500s with these mods and a tune. Haven't done the clutch/flywheel yet, that should free up over 20hp alone, maybe next year.

Another guy with similar mods made 430whp on pump @ 6psi which is normal when tuned, and made 485 when he switched to e85 with no other mods. So I think the extra 3-4psi should be good to get me over 500.

Switching to e85 has already solved so many driveability issues, the old tune was so crappy, running ultra rich. I would get 18-19mpg highway before, now on e85 and correct fueling I'm getting over 20mpg which is awesome.