Full solid hub is not really necessary on the 6 speed unless you race a lot. I had no issues holding the power with a Spec Stage 4 6 puck sprung, but anything more than 500whp and you ought to go a little more aggressive. The 6 speed swap isn't cheap, but it is an amazing parts bin solution to the fragile 5 speed. The compromise is there, for sure. But it certainly seemed like I was breaking every transmission I put in after the first 1. My first p11 trans lasted years, but once I got over 400wtq they started breaking left and right.