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Just today an 2004 E55 cam in with 25k miles on it and tossed down 420whp and 480wtq yes 480wtq! bone stock! It might be worth looking into for a free update... Thats if you dont have a tune.
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I figured that you would want to lean out the fuel mixture to increase hp??
I figured that you would want to lean out the fuel mixture to increase hp??
on a scale of say 8-15 and 12 being the optimal (this is just for an example some may like there AFR in a slightly different spot). this AFR was at 10... 2 points off what might be considered a good area.
The way I see it is 12.5 to 11.5 is the area I like to be in. If its higher than 12.5 "I" would consider it a bit lean. If Its lower than 11.5 it might be considered a bit rich in the fuel mix.
Being this AFR was in the 10's It can be leaned out a bit thus making some horsepower.
Granted there are a ton of other factors that are in play. Also I just using these numbers to ballbark a bit.




If so, I better call my dealer here !
this would be the only way I'd trust doing this. The load limited update didn't aspire too much confidence regarding MBUSA's "improvements"








