A&A has a 'race prepped' case they sell. It's probably a little lighter than your garden variety TF case though I'm not sure how much; we're probably talking a pound or less. They machine an access hole into the bell for converter bolt access so I'm sure that accounts for most of the weight difference. The best thing about it though (besides being sparkly clean) is they tap the pan rail for external pressure adjustments so you don't have to remove the pan to do it. There's a tap for a trans brake too. I got one for my 904, really nice to work with.
