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i have metal masters up front and ultamites in the rear, i'd tell you how it feels but i havn't even finished braking them in yet. But even in brakein period, they work great. do stainless steal lines really help a lot or what?
I run the Axxis Ultimate Ceramics on my DSM w/ the 2-piston caliper upgrade and I have to say, I really don't like them that much. I guess for a street pad they're just fine, but I'd NEVER go to the track with them. I've already noticed the limitations of the Axxis Ultimates with just street driving. I like their cold bite, but I'm not pleased with their hot bite at all, and I don't feel confidant making repeated hard stops or anything like that. They seem like they fade really easily, but they're quiet, don't dust much, and feel pretty smooth.
As far as Porterfield Pads go, I absolutely love them. I ran R4-S's on my DSM before these Axxis pads and they lasted 35,000+ miles without any problems aside from wearing out. They had nice cold bite and never faded on me once, but what they did do was dust an unbeleiveable amount. Holy crap, SO much dust, and I hear the R4-E's are worse. Anyone i've ever talked that's ran R4-E's has told me they'll never buy another pad again, at least for racing anyway they're pretty much awesome, and that's all that RRE runs on any of their race cars.