--I think 15G can be good for about 580hp at wheels maxxed out with standard stuff.
My car made best 575 or so at wheels no NOS, but that is not "maxxed" because I always had stock intercoolers, no headers, no head/intake/throttlebody porting/ignition/standalone computer--with THOSE parts, my "maxxed out" figures could be somewhat higher...
Best 3000GT/Stealth ET/MPH overall is still my 10.810 @ 128.44 with 15G's, 50hp NOS on 6/3/97; I had the distinct honor of making this pass lined up with the late Jeff Curtis in his Stealth...
I'd not hesitate to get 13G's if desired and price right. The 15G make more topend, and I think they are worth it. 17G and more exotic turbos have yet to put better numbers to the pavement. When they do, we'll see what other mods/weight reductions etc are on the cars doing it. 15G are still unbeaten, both on motor and with NOS; are capable of 125 mph quartermile / 575+ hp AT THE WHEELS no NOS in my car, with only piggyback computer mods/no porting/enginework beyond the boltons. Pretty amazing, really.
Jack Tertadian
Atomic Motorsports
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