I don't have an EGT gauge in my downpipe so I don't really know what the temps are coming out. I started with the log manifold and am only keeping it until next spring, then switching over to a Full Race set up. Before I blew the motor up a couple months ago I was pushing just over 400 at 16.5psi, haven't finished tuning with the new set up yet, once I do I am gonna put it on the dyno at work.