He should port / polish his intake manifold and heads by pouring sand into the intake while redlining the engine
works every time.
Tell him he doesn't need to take his oil drain plug out either. All he needs to do is take the oil filter off and start the car. It will drain the oil really fast.
2011 Mitsubishi Lancer GTS - DD mode
1991 Mitsubishi 3000GT - Many mods to come