With that said I am not familiar with that Mainline brand dyno. My concern would be that it looks like there is no physical link between the front and rear. That can be an issue on the Golf R as it is not a full mechanical link in the awd system. Due to this they need to be run at the same speeds or the haldex can be damaged. I would check into that before running on that dyno.
Neither am I but it appears to be very similar to a dyno dynamics.. funny since they are both from the same place. Its been a very long time since I used a dyno dynamics but they had no issues with AWD cars even though the rollers were not linked.
With the power consumption units/ retarders on both axles the unit can control wheel speed to make sure both are spinning a the same rate (assuming the vehicle is powering those wheels). I'm blanking but I think the maha was the same way, been a few years since I used one of those too.
We have both a mustang and a dynapack. We shipped the dynapack over to our UK facility and our in ground mustang install should be done in the next few weeks. I wanted to repaint it so I'm holding things up
As others have said what matters is using the same dyno and comparing that, try and setup the dyno as close as you can each time. For example on a DD and possibly this mainline if you loosen the straps and let the car inch up on the front of the roller pairs they'll show more power because the rear roller isn't feeding the power unit and you now aren't pushing that weight. So if you strap them down different each time you can get wild variations. That is one advantage to the dynapack, but there are disadvantages as well.
