People, don't do it while they're on the car! Go ahead and tell me how many times you've gotten away with it doing it to other people's cars, use vacuums to suck it out the outlet, but until you see how much dust can still enter the combustion chamber through an open valve you won't understand. I don't care if you do them by yourself or buy them from me as some people have accused me of, but
DON'T BE LAZY! I'm done now, thank you...
Jiako, yes, both front and rear exhaust manifolds.