When I do track-car wiring, I don't think so much in terms of what can be removed, I think in terms of what I have to keep
~
*Engine harness (a tuck all by itself, you can remove approx 25% of the wiring from a KA - power steering, EGR?, A/C, etc)
*Lights - can't really trim anything here, except for maybe corner/marker lights
*Power windows/sunroof - need to keep this stuff most likely
*HVAC - I like to keep the blower motor and controls, if only for the defroster
*Gauges - If you want to keep the stock dash, you have to keep the huge cluster of wires running along the dash bar... if not (like my car), tear it out!
*Radio - running an aftermarket amp with new speaker wire, or not running a radio at all? Tear the old shit out! I will say, being the only car at the track with a nice/full sound system
does have it's advantages...
*Fusebox - here's where you can trim some
serious fat - run an aftermarket fusebox in the glovebox area, and you can ditch the engine bay fusebox, the kick panel fusebox, and the SMJ! That's the real meat of any wire tuck.
Where does that leave you? Well, if you do what I did and cut out the pieces of the stock harnesses you need, and throw everything else away, you end up with about 40lbs of harness per car. I've done 3 or 4 cars now, and have a few HUGE boxes full of OEM wire left over lol...