two years ago when i got my first kit, julio (RAZOR) offered the PAC system barebones at 409 and with everything (low alky sender and wiring ,meth filter ,and overflow) it was 480 , i got the full option kit and it was worth it then when 93octane was about 1.50 a gallon and racegas was about 8.00, race gas is now near 10.00 in some tracks .
the the TTA kit was similar to the GN and was 339 bare bones 410 complete kit , price is lower due to the fact that TTA kit didnt come with 3bar map since it already has one from factory)
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if you had a 3bar map you could save another 70 (two years ago) on your GN kit so if your buddy bought a barebones without a 3 bar MAP he would have paid about 350.
his new ones are only a few dollars more than they were then and are the full kits now (not barebones) . he now does his own inhouse blueprinting of the pump to correct some deficencies and has a new alky pressure indicator incorporated into the system , and if you have a 3bar map you can still save a few $ off his current kit price .
BTW i feel julios kit was the single best purchase so far for my GN , well two best purchases since i have one of his kits on both cars.