I installed the one off of ebay for like 16 bucks. It includes the stainless cross over tube, rubber coupling adapter, K&N style air filter and some basic support aluminium straps and what not..
In my opinion this is a rocking deal considering you can't even get a generic K&N at autozone for less than 20 bucks.
When I floor it I can hear that really neat throaty import sound from the intake.
Definitly worth the 16 dollar investment...