I've seen dynos on both the hub and at wheels (a few of which were at ATP) hence my
 

using ~ and a range. As usual, one can't easily compare numbers between dynos and, again as usual, there seems to be a raging debate everytime one tries to discuss the delta between wheels and hubs. From looking at different dynos (and taking into account the potentail difference from car to car let alone dyno to dyno ... I'd WAG that a difference of 3-5% less loss on a hubs pull than a (properly set up) wheel pull would be in the realm.

Re: Yea I was thinking right about the same with about 5% diff.

BTW .. APR hasn't had the 4 Hub dyno all that long. IIRC the kit was developed using a two wheel
 

dyno with some 'trick' in dealing with the quattro. I read an account of how another shop dealt with an awd car on a two wheel dyno but I've forgotten what the 'trick' is.

I've had the apr kit on my 01 for 2months now. runs great, runs strong. .....
 

just added a custom turbo back 3inch.. a bit loud but it really opened the top end. i had the wastegate adjusted and it now holds 21lbs..
oh and im tired of hearing about "driveability" its drives great around town and is not a hassle what so ever.
pull your panties out your asses for ever asking that question. you know who you are.....