For the diff cover and pre load bolts. Lock tite. I believe it's the Blue. DO NOT USE THE WELD. I believe red is the weld. The diff cover is 6061 T6. So it's got some pros and cons with threads holding. But I won't knock what he makes and sells, Front line is a great guy.
I would look in to get Evo LSD guts. And go tht route. And 800 whp is a low 9 sec car with the right set up and driver. I need to up date my build thread to night. But Im going with a goal well above you whp wise.
The Red Demon doesn'f run a 3000gt rear diff. Get the Front Line Fab rear diff cover the 300m trans parts and a PPG dog box. But I have toask how much WHP is the guy putting down?
I have a build thread let me choke down some coffee and I'll bust out the laptop and post a link. But in a nut shell. Manley rotating assembly and a BW S363