My car is a race only application, but one of the things you can do is; If you are driving it on the street with an exhaust evac system, disconnect the hoses at the evac valves and let them vent under the car. It will keep the engine compartment much cleaner. Then when you go to the track, pull the exhaust system and hook the hoses back up. When I am testing on the street with mufflers hooked up, I usually pull one hose so the crankcase can vent at higher RPM's. Pic is of home made water monometer I used for evac / crankcase pressure testing.