Well i have the 2.9 now. wines pretty good. I plan to weld off the silencer ports too. I am not installing a pulley right away. So chances are ill slap it with 20* of timing or more on the 2.9 with the Meth and the cam. Currently im seeing boost at 14PSI at the top of 2nd. Im expecting that to nose dive with the ported heads, headers, cam, and catback.