well i have looked and cant seem to find much info which surprised me, well i did a 6 speed swap on my wrx and i have a wrx auto driveshaft, and an r160 that a put my old vlsd in just to strengthen it up some and help with how it handles, well the wrx driveshaft i got has a crapped out carrier bearing, i get the " wood pecker noise from it at start off "
so i looked around and started to concider a one piece aluminum driveshaft, and realized that this was just not the way to go, ( still dont know why they dont just do 2.5" with a little bit thicker wall ) but since they dont im going to do with a custom 2.5" steel driveshaft, i have a few shops to choose from, but there isnt much info on nasioc about it, my biggest issue is what are the lengths of the wrx auto shaft, ( to lazy to pull off the car ) and sti shaft, i want to get one made to where i can run it with the R160, and then just switch the pinion mating flange and be able to run it with an r180, is this possible???
also with a steel driveshaft you wont be limited to the crappy 150mph, or the rpm limitation which isnt listed since aluminum if it has impurities will expand like a ballon untill it basically explodes ( no one like to talk about this , but being in mechanical engineering you learn its a very likely possibility )