I've been using welded diffs at the drag strip for over a decade. You clearly have no experience to back up your opinions that you spout off wrecklessly.
Your rb26 doesnt make 400 whp..... you may not realize it, but me telling you that is a compliment, because if you have a rb26 that makes 400hp at 5psi, then you have a fucking worthless piece of shit engine and whoever built it is one of the biggest fucking morons on the planet.