I think the part# is AF 19037. I got mine locally for about $55. 00. (was quoted $48. 00, then when it came in I was told there was shipping charges too

)
I'm not really BOMBED. All I have is injectors.
It might have lowered my EGT's a little, but I'm not really making that much power. About 260 HP.
I forget who is making the guards. Malloy? Mallory? Something like that. I dont believe he's doing it anymore. If he is, please let me know.
Someone else was making a cover that goes over the turbo. I totally forget his name.
The filter is really BIG!! I dont think I'll need an air filter for at least a few years.
My problem was, when I put in the injectors, and adjusted the boost rod, I got 60% used on my filterminder. Before the mods, it was virtually a new filter. Guess going from 28 to 38 PSI boost will do that.
Sorry I couldnt be more help.
Eric
PS Someone had one that was used slightly. I could go through my PM's this weekend, and let you know who it is, if youre interested?