What's a good fuel pressure to run for a 87 GN with stock turbo,injectors,Red Armstrong XP pump,93 chip, ATR 3in down pipe and adjustable wastegate.Right now I'm running 17 pds of boost and detonating in 4th gear with 40 psi's of fuel pressure w/ vacumn connected.I'm fine in all other gears with less than 3 degrees of knock on my Scanmaster,but am seeing as high as 10 degrees at WOT IN 4th gear. I have an old Kenne Bell article that recommends using 104 octane booster for WOT throttle in 4th gear.I'm going to try this next but not sure if I should raise the fuel pressure also.I have Turbo Link software and they say start w/ 40-43 w/vacumn disconected for 17 pds of boost.How high do I need to go with this combo? Does 104 really raise the octane that much? I know I'm looking for a magic pill but I don't want to experiment too much with that kind of knock at WOT.I have 12,500 orig. miles on the motor and would like to keep it that way without blowing it up.Kenne Bell says to use 104 if you plan to do any racing,everytime I get in it I want to be able to get on it and not worry. Thanks