I replaced the exh ones because I simply could not figure out how to get them apart. I called a few subi shops and they said it was a bitch to do
I tried flushing them out without taking the rotor out since I could not figure out how and even after 5-10 min still saw metal bits coming out every now and then so I just ditched the idea... worth 250$ to just not have to worry about it
The intake ones came apart ezpz