The 20-0092 CCV Catch Can Kit runs inline with the 1/2" valve cover breather port and air intake pipe. At low loads it experiences atmospheric pressure, but when the engine is at high load (WOT), this hose will experience vacuum and would normally be drawing unwanted crankcase vapors, unspent fuel, and oil sludge into the air filter intake pipe. If the engine is turbocharged or supercharged a catch can will help keep oil out of the charge piping. This kit is compatible with all strut tower braces.