I dont know about "have to" but I bought a new updated turbo baffled one and it did not match what I took off soooooo..... I drilled the other holes that were in the original. I made sure to keep a shop vac on it to grab what came off the drill and flushed through it until i was happy that it was clean. I have no idea if it made it more gooder but it made me more confident in the oil flowing through it as it needed to