RRR

So what's the problem I think perhaps the offside rear caliper's dragging but that wouldn't account for much would it 30%'s a hell of a lot but then the car still feels quick.

It does when you've not got the power on. The V6 has so much easy torque that you wouldnt notice a sticky caliper when driving, but when its measured and just free wheeling the dyno will pick it up.

But, if you watch the video, it only briefly picks up to 62bhp, its mainly around 50 odd bhp.