Maybe not as much as you think but quite a bit of money for those parts..
I don't think the design changes much just the quality of the parts...
Billet this and hardened that and treated this and Kevlar that... A lot of high-end parts and then when you say live nothing lives for ever... I know AAR cuda usually gets I think he said around four seasons or so on his transmissions doing low tens.... I don't think he does a whole lot special...
