I posted a test I did after I had the car chipped. It had been raining so I did a little test one morning on my way to work on a secluded airfield road. I turned off the traction control and manually shifted the tranny into 1st gear. I power braked it to about 2,400 rpm then let it rip. The rears broke loose and when it hit 6,000 rpm I shift into second and the rear wheels kept spinning and building speed again at 6,000 rpm I shifted to 3rd the wheel spin continued and I got out of it. I never got over about 5 - 10 mph. This tells me that I Dyno run may very well be possible. I never tried it before the chip so I don't know if the chip is what made it possible to hit 6,000 rpm with the front wheel hardly turning..... That's why when I get back I'm taking it to see if it can be done. I've been on a Mercedes forum and they seem to have no problems Dynoing the SLKs as long as they have a fan ramming air into the front of the car.