2004+ Subaru WRX STI Replacement Steelback Brass Disc by Competition Clutch Competition Clutch Replacement Full Face Steelback Brass Plug Clutch Disc. This is the same disc that comes provided in many of the Competition Clutch Steelback Brass Plus Clutch Kits. Features Available for separate purchase without the need to buy an entire new clutch kit Same disc used in the 15030-2250 kit Brass plus sprung hub clutch disc Benefits Ideal for aggressive street use and moderate track use Applications 2004-2020 Subaru WRX STI What’s In The Box? 1 – Replacement Clutch Disc Warranty Competition Clutch Inc. (CCI) warrants covered items to be free from defects in material and workmanship for 90 days from the retail purchase from an authorized dealer.