The 20-0425 Catch Can Kit, CCV, Civic Type-R fits under the OEM engine cover with no modifications required.
The catch can secures to the RH motor mount (shown above). If an aftermarket motor mount is used, minor modifications may be required. This catch can runs inline with the crankcase vent port. At low loads it experiences atmospheric pressure, but when the engine is at high load (WOT), this line will experience high flow out of the crankcase. This would normally lead to oil and sludge accumulation in the air filter intake pipe. Oil accumulation will occur in the intercooler which lowers the thermal efficiency properties of the heat exchanger and leads to decreased performance.