I have a 1995 Toyota Supra 3.0 twin turbo.Question:  My Supra is a conversion from N/A twins and I still have the stock w58 that came with the car. I was wondering if it was worth rebuilding this transmission seeing as how I'm putting 400wwhp to it or should I just upgrade.Answer:   We would suggest that you elect to rebuild the current transmission and cryogenic treating all of the critical hard parts, as the 6 speed in very expensive and impossible to find parts.  We can rebuild your current unit the price would be about $900.00 include all new bearings,  Gaskets, seals and syncro rings.Cryo treating is $10 per pound estimate around 35 lbs and additional $350.00 add about 30% in strength.Freight will be added. For additional information give Scott a call 888-0824-2012 he can help you.