oil catch tank

what does it do if someone can explane it to me that would be awsome thanks they have it at the www.3sxperformance.com under engine external bolt on its the last one if some one can explane it to me that would be awsome. thanks

Oil in the heads sometimes exits the vacume hoses attached to them, mainly the rear one where there is vacume, this puts oil in the IC pipes. You would put this in line with that line to catch the oil from going into your intake.
If you decided to go with a blow through setup this is generally a good idea to do, but can be made at home depot for extreamly cheep. There are other was around it too.

Lol so it's just a bottle with vacume hoses going in and out, what a high priced bottle lol.

Exactly, home made = $5