Hotchkis Sport Suspension 38104 Chassis Max Spacer Kit for the Hotchkis Chassis Max Brace for 2010 - 2012 Camaro's with Large Exhaust Systems. Aluminum shim kit to lower Camaro Chassis Max Subframe Brace (part 20104) a 12 in. Includes 6 aluminum spacers and longer grade 10.9 hardware. Due to the manufacturing specifications of some brands of long tube headers and exhaust it may be necessary for some cars running the Chassis Max brace to purchase this shim kit to clear the exhaust system. We offer this aluminum shim kit which will lower the entire brace assembly 12 in.. Kit comes complete with 6 aluminum spacers and longer grade 10.9 hardware.