At 400+hp, What kills A904s?

Yup, I'm a cheap *** allright. I build EVERY 904 and 727 with FIVE .061 Red Eagles and a Kevlar band for $600; along with drilled vb plate as per TransGo. I do the 350, 400, C4 and C6 same way. Problem is actually that too many guys are too chickenshit to do all the work needed to change over to a 727. Gimme a break, oem frictions are $2.50; Reds are $7.50 ea....$25 more per trans..big deal...Kevlar bands $22 free shipping...
You don't have no power