Wait your right I lied... sorry its a COMP 284XE. That would make way more sense.... sorry about that, its been a long time since I put it in.
So no a 256 should not lope unless it was cut with some insane separation angle. The cam in my hemi truck is much more aggresive than the 284XE in my car but idles much better because it is a roller and has a 4° wider separation angle, but there are many other factors that affect idle quality too.
But ya x-pipe is the way to go. And since a bunch of you were talking about the hooker mufflers I have to give them :thumbup: