I need to make a decision here in the very near future. Either purchase my own building or an AWD dyno.. As far as Mercedes Pricing I have heard of pcm flashes any where from $1,000.00 to $2,500.00. I am sure you can find it for less then a grand. MHP here in Columbus brings me a number of Mercedes including E55's. 30-40 rwhp with just a tune.