Not on this engine. Not sure if I'll run this engine on the dyno or not, might just fire it up in the car and go from there. This engine has been on the dyno before but not with the EFI setup. On my 514 there was a little bit of manifold vacuum even with a 2000 cfm throttle body. I'm not going to worry about it on the Duster though since it probably has enough beans to run 9's and I'm only putting a rollbar in it. I'll most likely have to throttle stop this engine to stay legal at the track.