Never had it on a dyno. Been about 8 years with the same combo. Tried different shift points and likes 6400,. I notice the smallest head wind slows the car down, Not being the most aerodynamic body style. The 2 times I took it out had some low wind, I think this might be some of my problem since I installed the 850.
It did mph a little better when I was running a 30" slick. I switched to a 30" radial 2 years ago. The radials hook a lot better and are more consistent. Not knocking slicks, just radials work better with my car. Stock suspension and 3400lbs.
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