Thanks for the input Ron, i suppose there are no negatives fitting one apart from the cash outlay so i will probably go ahead and fit oneOh, there are gains alright. It's just nobody has done a back to back with the vr. I think, back in the day, Krankvents did. At any time there is ring float, blowby will increase and a slight drop in hp. Serious racers even go to the extreme of running a vacuum pump to make sure the case in negative pressure to keep the rings from floating and keep pistons from trying to compress air on the down stroke which robs power also.