Just picked these up from Porterfield. Some pics for those interested.

 

Is that a "race"compound rear shoe? Hmm....wonder about GD applications...

 

This is their Street Compound. I'm not sure if GD uses the same, but Porterfield can make them in race or street compound for you. R4 is their race compound.

 

Here are some installed pics of the pads. Notice the comparison of the stock shoes and the Porterfield ones on the 3rd pic. This is after 36K miles of driving, barely any wear on the stock shoes. i would think the stock shoes can last 100K miles. Now that i have seen it, i probably wouldn't have spent the money on the Porterfield shoes.

I also flushed the fluid with StopTech STR 600. One 500mL bottle was enough to flush the whole car.

Stock shoes for sale if anyone wants them, $30 picked up in orange county, ca.