Oh...when they say "X-pattern", it means "cross drilled". So your concern is why does the front rotor cross drilling look different from the rear...well because they're made by different companies and the front rotors are vented while the rear is solid.

When the rotor is vented, you can only drill in the vanes, the empty pockets, the voids meant to expell the hot air. These vanes have a curved shape in this case (some cars have straight, but these are not). So the drilling pattern has to follow the form of the void. Below are a couple of examples take from AP Racing's website, which by the way was bought out by Brembo some time ago I am told.





With a solid rotor, you can put the holes almost anywhere you like, as long as its symetrical in the end so the rotors are balanced. Certain methods and designs are inherently cheaper than others. Straight vs curved in the end doesn't account for much real difference in performance on the street (these are street systems). Just like everything else, its a measure of performance vs cost.

cheers

W

 

does the rear "move out" kit take into account the increase in rear brake bias? does this basically have to be done in conjunction with the front bbk?

this sounds like the best solution, but it's also 2 years old.

nevermind, they're selling a larger solid rotor... i gives up with this shit.

 

anyone think these

http://www.eliseparts.com/shop/index.php?m...0b62078ecb78252

will fit the s with a minor bracket change?