My Perrin filter came in a sealed bag pre-oiled ready for install. Install took 2 minutes, duh its a drop in air filter.:tard:. During my test drive there was noticeable improvement in throttle response. The only flaw I see with it is that it is a wet filter (oiled) which means that I will have to clean my MAF sensor more than I would with a dry filter, but just from my 30 minute drive I feel it is worth it.