Look for a Scirroco 2.5" dual downpipe, 2.5" exhaust, and a 1.8 gas header. Should wake up mid-range. Local guy to me gets close to 60mpg out of his. He did all of this with some tweaking to a rebuilt pump.
Actually did some tinkering today and now I need more air!
I re-indexed the throttle lever. Basically I pulled the lever up just enough to allow the lever rod to clock one tick clockwise. That allowed the idle to run WAY down. Then I turned up the max fuel screw about two turns. Lots o' black smoke when I want it. Pulled up to 1200F on EGTs on the uphills. I'm going to do a little more tweaking but I'm pulling 20psi of boost now. I think I'll leave it alone for now. (No camplate or head for now) I've got a intercooler I've been meaning to install too...