I read good things about Powertrix on here also.

This is why I didn't go KW's also. Progressive rate springs on stock top hats, no thanks.

Problem with stance for me is that they are true type coils, no? That'd bump me into a class that'd be even further out of my league. I was thinking 12k front 10k rear.

My AST's normally come as true type coilovers for the rear. When I ordered them I simply explained what I wanted the spring rate, free length, and ID of the rear springs to be and they supplied the shock and spring separate. I'm guessing that maybe Stance could do the same thing albeit maybe for a small up charge.

Also, you might want to consider some stiffer springs as 12k and 10k are a on the soft side for running ASP with big wide sticky Hoosiers.

Right now I'm running 275 front 305 rear nt01's but I know to be super competitive you need wiiiide Hoosiers and stiff suspension. The place I was thinking of that customized KWs was Robispec but it looks like they're not around anymore of course hah

Robispec is a motherfúcker, stay away.

And I believe Stance will make you a non-true type.

Just reached out to Stance for you right now. I will let you know when I get an answer!