yeah...sired94 said...don't worry about the crank. one of the weakest parts of the ka are the rods. no offense, but if you're not sure what you're doing...just take the entire bottom end to the machine shop and have them measure ALL TOLERANCES. the only thing i'd get done to the crank is have them polish it.

i also wouldn't worry too much about having them do head work, unless you just want it leveled and cleaned. a nice cheap head upgrade (depending on what year ka you have), is installing 2 exhaust cams out of a 91-94 KA...they have a slightly higher lift....248degrees compared to 232degree. it'll feel a little more torquey, and will be noticeable on boost.

aside from that...i'd just make sure you buy a decent wastegate and blow off valve. i had a ebay wastegate and it stuck closed...i boost spiked and trashed my motor.