ECS 12.1'' rear 2-piece rotor upgrade.
 

<center><img src="http://www.ecstuning.com/stage/images/product/brakes/ECS-Stage1R-S4/BeautyShot2-300x421.jpg"></center><p>The ECS Designed Advantage
The ECS Stage 1 rear upgrade for B5 S4 replaces the heavy single piece stock rotor with a 12.1" light weight ECS "Tru-Float" 2 piece rotor. Improved clamping leverage increases brake torque, improves pedal feel and reduces rotor temperatures. The ECS Stage 1 Rear kit for B5 S4 includes 12.1" (306x22mm) slotted or cross-drilled/slotted rotors, caliper carrier relocation brackets and bolts, vinyl coated stainless-steel brake lines and banjo bolts.
overview of the complete kit:

rotors calipers pads fitment
12.9" light weight 2 piece floating (306x22) OEM Stock - single piston floating with ECS carrier bracket OEM OEM 16" or larger (note because the caliper is moved outward "deep dished" wheels may require spacers)<ul><li><a href="http://www.ecstuning.com/stage/edpd/pagebuild_v2.cgi?html=info-B5S4-Braking-ECSStage1R.html&amp;make=Audi&amp;model=B5%20S4&am p;submodel=&amp;engine=2.7T&amp;category=Braking&a mp;subcategory=ECS%20Stage%201R">ECS S4 rear 2 piece roto

FYI - in my post below, I was referring to 1 piece rear slotted rotors on back order ;o)

your advertising is always wrong... why say 12.1" in the first paragraph and then 12.9" in the...
 

second paragraph... c'mon guys get it right...

YGM.

"light weight" - so what exactly is the weight savings?
 

When I first saw this product I saw that you claimed "light weight" but no where do you say how much weight is saved. This is important information if you are claiming a weight savings. Unsprung weight is important!

Stephen

Re: How is "clamping leverage" improved without changing calipers?

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<center><img src="http://pictureposter.audiworld.com/20137/rotors_1.jpg"></center><p>