I got an email from Centric specifically asking about their plain surface (no slots, no holes) rotors and they write: "These rotors are designed to be OE replacement rotors. They are not designed for racing use. ... These rotors are manufactured in China to our specifications."
Centric part numbers are:
Front: 120.62075
Rear: 120.62076
HUH... Interesting - Maybe I didnt get Centric then - I just assumed they were because they look similair to the ones in the OP just without the Holes.
I was told by Porterfield that the Rotors I purchased were made in the USA, and would be Perfect for Racing Applications
Also your email was for the Plain Surface style - I wonder if it defers for the Slotted, or Drilled? Plus if they are manufactured to OE specs then they should be more than enough for a Few Track Days.
* Found the Email from Wendy at Porterfield -
From: Wendy @ Porterfield Ent <
[email protected] >
Subject: RE: Cts-V Brake Rotors
To:
[email protected]
Date: Friday, January 16, 2009, 10:06 PM
Slotting is an extra $30.00 per rotor. By premium they are a high quality cast iron rotor. We never guarantee brand’s but they are from north America or Europe as that is where we get our rotor from.