Not an X164 but still cool.
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Join Date: Aug 2003
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E55, GLS450, GL63, GLE350
It's Renntech and they are a tuner in Florida. The owner was, at one time, the head of AMG. Their stuff is pricey but top notch. No BS with their tunes or products. On my old CL600, I picked up over 125 RWHP with one of their tunes.