I tuned my wot for about 11.2 +/- when under hard boost. As far as plugs I use autolite 3923's and they are hot enough to not foul easy and cold enough (at least for me) to not cause problems, Smitty

Stock 500EFI's M3SC Procharger's, Coolers, 7-8psi
Upgraded fuel system, filters, injectors
Not sure on the exact HP about 750-830
Procharged since new in 2001 for 220 Trouble Free Hours!

30 mile run 80-97mph near WOT
1450deg egt
53psi fuel pressure
130deg water temp
35psi+ water pressure
150deg oil temp
50lbs oil pressure

Needless to say I am VERY impressed with this setup!

as you should be,220 trouble free hrs would make the devil happy.sounds like a nice setup.

Did you change the oil coolers from stock, your running hours are pretty impressive, I rebuild mine at 1/2 that amount and I almost always find a part that was on verge of self destruction, Smitty

Has anyone thought of running two small prochargers instead of one big one? I know it will make more horsepower at lower boost levels but I'm wondering if two small one would keep the IAT's down...

yeeep!! livousi has,had built or use to build a twin powerdyne set up..worked great but dont know if they are still at it..

I remember the pics on their site, would be a BIOTCH on a twin engine boat though!

Ours has given us many years of great service.
509
M3
7 lbs boost
815+ hp @ 5500 rpm dynoed
A/F 12.3 WOT
Gil exhaust
Plugs Auotlite AR3935