I just put new pipes on mine last week. I used new gaskets. The new pipes did in fact have ports for o2 sensors. I went to the auto parts store and got two 18mm oil drain plugs, and used brass washers. Worked great and haven't had a problem with it at all. The oil drain plugs kinda stuck out so i painted the bolt heads flat black with a q-tip. Looks great, not very noticible... and i spent around 8 bucks.