NOT TRUE, It's a hit and miss they should stand up to 13's easily. 99% of people will tell you that you need a new built tranny to handle the power but I have seen people run stock tranny's for a long time and as long as you aren't doing a lot of track time you should be fine they just want the comfort of being able to say their tranny's wont break.
Im with what your saying on that Mine had almost 190000 mile on it so it was time
But im assuming with a turbo build you are pushing higher hp and actually going to see some track time
Thats just where my thought proccess is
98 gtp sedan forest green ,S1X intense cam,Intense pcm,Magnaflow exhaust, ubend delete,TEP trans 3.29's,3.4 smoothflow mps,Dyno'd 281hp and 371ft #'s of trq at the wheels http://www.cardomain.com/ride/3338681