if you use 30e slugs its ok. but the 30et slugs just kill the Compression, throw some CP 9:1 pistons in there when you pull the others out and with -5's it should be an animal.
1. i just used the Flywheel from my 25 on the 30, make sure you check the spiggot bush in the crank make sure it suits the 25 gearbox
2. power steering belt is different on the 30 (v belt)
my car has over 300kw @ the wheels and having been in an EVO with ~200kw up to about 100-120km/h both feel similarly quick. its only after you hit 3rd in the skyline that it stretches its legs and walks away.
the problem is he is doing clutchless shifting, so to flat shift that way you need to have a switch so it knows when to initiate the ignition cut which is why he needs the fancy shifter/gear knob to do it.
you can get an adapter to fit the stock throttle body to the Greddy plenum or just fit a Q45 throttle body. why go to the effort of reinventing the wheel?
12v and ground both work with a test light from the back of the alternator (battery voltage using a multimeter) but the voltage doesnt increase when the engine is started