So... looking at G3000 metal vs G4000 automotive metal:

http://www.iron-foundry.com/a159-aut...-castings.html

My findings from general web interneting:

G3000 < G4000 for rotors
Kiriu is the manufacturer for Infiniti rotors so buying Kiriu = Infiniti/Nissan OEM
DBA = Stillen

So here are some questions:

The only rotor I can find with the metallurgy listed is adamsrotors.com with their G4000 metal. But they give you a one line description with no other specs. Runout, etc.

I thought adamsrotors was just a machine shop that printed slots and drilled holes into OEM blanks. Therefore, where is the G4000 original blank that they are using on their premiums?

There is a clear spec sheet benefit to G4000 metal.

DBA uses XG150 - perhaps a patented name on a metal alloy? Better or worse than G4000 grey cast iron, given DBA's graphite content?
http://www.dbausa.com/what-is-xg-150/

Raybestos uses G3000
http://www.rockauto.com/catalog/more...id=383&jpid=32

Quote from Adamsrotors.com:
"metallurgy: pick the iron grade; G3000 is standard iron vs. G4000 high carbon which includes complimentary black hubs & vents!"

So is G4000 just a high carbon metal, then? Same thing as Centric high carbon premium, and all the other high carbon guys out there?

There seems to be a LOT of marketing in rotors. "Cryo" = worthless, per research I posted on another thread. Slotted/drilled for what, braking from 150 mph on a track. Part of the dice roll is having zero spec sheets on this stuff, just a bunch of marketing fluff. Big money no whammy is all you can hope for?

Many people have been telling me "do this or that, good enough call it a day" but... Somehow there is literally no solid documentation of what you are buying. "We use THIS metal alloy" would be what I would assume anyone not melting nails into a circular shape in China would post all over their documentation.

So... for me then...

DBA vs AdamsQuestionmark vs EBC premium blank vs Raybestos.

I'm leaning toward EBC from Joker's review, but thought any engineers on the forum might be able to explain to me what exactly I'm buying, and why it's better than one thing or another. Minus marketing puffery.

 

http://www.autozone.com/landing/page...st-gold-rotors

how about these? are these G4000 relabeled? I am just basing this on color.. I m looking to buy rotors in the next couple of months, and it would be great to buy some local