I took my 2018 Tahoe to CJ Tunes over a year ago. Converted it to E85, along with a 6.2L intake manifold and throttle body, as well as AirRad intake tube and air filter. The end result was amazing. Never dyno'd it but I would guess maybe about 450/450 crank? It HAULS BALLS, and has performed flawlessly for 15,000 miles.