bolt-ons: intake manifold, throttle body, header, a turbo BOLTS right on...a nice set of cams would be nice. not too hard to change them out. but...taking off the a/c compressor and powersteering pump ill also help (but i like turning). i've just heard bad things about the crank pulleys UNLESS you get the motor balanced and blueprinted.
o and a flywheel, i've driven my buddies b18 EK thats boosted with the lightened flywheel and its a REAL paint in the a s s to drive.