Got some info in from Brembo, really puts it into perspective why they are the among best brake companies in the world. Not trying to start a huge debate here, just passing their info along to anyone who is interested. Original Equipment Manufacturers Who Use Brembo Brakes: Acura AMG Mercedes-Benz Aston Martin Audi BMW Cadillac DaimlerChrysler Ferrari Ford Infiniti Jaguar Lamborghini Maserati Mitsubishi Nissan Porsche Subaru Original Equipment Manufacturers who use Stoptech brakes: None Brembo Factory Equipped Supercars: Audi Le Mans Ferrari Enzo Ford GT Maserati MC12 McLaren F1 Mercedes McLaren SLR Porsche Carrera GT Nissan Skyline Saleen S7 StopTech Factory Equipped Supercars: None Brembo Dominated Motorsports: Formula 1 World Rally Championship NASCAR Champ Car World Series Indy Racing League American Le Man Series Grand American ROLEX Sport Car Series SPEED World Challenge FIA GT Championship StopTech Dominated Motorsports: None. -Brembos F50 style caliper weighs 7.4lbs unloaded. The StopTech copy weighs 7.9lbs. -The Brembo 355x32mm disc is what StopTech used to copy for their rotor. Whose kit will weigh less? -Brembo has over 400 engineers and Brembo owns their own foundries. -Brembo Foundries pour over 200,000 metric tons of steel every year making rotors. -Brembo Foundries pour over 7,000 metric tons of aluminum every year making calipers. -Brembo is ISO 9001 and StopTech is not. -Brembo is QS 9000 and StopTech is not. -Brembo has AVSQ 94 and 14001 Certifications and StopTech does not. - All Brembo parts meet TUV approval. - StopTech calipers are made of Squeeze Forged aluminum. What this means is the foundry does not know how to cast aluminum without porosity problems.