Derbo you gotta let me know how you like the 440/550 spring rates. I'm thinking of going higher, and Murph is talking about like 500/600 rates or more. But I assume he's talking Solo Nationals in Lincoln on AST double-adjustable dampers (wasn't he on AST 4200's?). And I need to do a few more AutoX and track days on my current 375/430 springs first.