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Actually if you have an aftermarket intake (specifically J's, Mugen, ASM) the oil change is a snap. 15 mins, if that and thats by yourself. I changed mine for the 20th time already with this bumper.
How does the cai facilitate the oil change? Maybe I have crappy tools or I don't know any better. The hole on the undertray isn't large enough for me to fit my torque wrench onto the drain plug of the oil pan. So I have to pop the undertray off each time I change the oil.