Don't know if this is in the right section but why would you do this?

 

Cowl CAI, very common.

 

What are the gains? Because I want to relocate my air filter

 

Air is taken from outside the engine bay.
Some folks like 'em, others say they are loud....very loud.

 

I'm either going to do the cowl or this

 

Nope, you'll be drawing in very warm air, hotter than you are getting from your stock airbox.

 

Do you know of a how to for it

 

No, but I can give you a link to the ones on my site. Not cheap, but they are Fawesome.

 

Ok

 

Good....
http://www.seriousoffroadproducts.co...s/Rugged-Ridge

Fawesome....
http://www.seriousoffroadproducts.com/Air-Filters/AEM

 

Neither work

 

this why you should update your profile with your rigs specs, or add them to your first post.

 

I meant the links don't work

 

Cowl intakes are like snorkels. You're moving your air cleaner out of the way of water intrusion. There's a company called THOR that makes a kit (http://www.thor4x4.com/) or you can make your own. If you google, I'm sure you could find some threads about it. CAI are not the same as a cowl or snorkel intake, btw.

 

The cowl intake does more than suck in cold air. It also raises your intake higher and in a somewhat sealed location. Similar to having a snorkel but a little lower.

Alot of us run the one you pictured.

(mine)

The chrome one is made by spectre- 100-150$. Replacement filters are 45$

There is also a black one made by Thor.

The only downside (to some people) is they are kinda loud in the cab when you stomp on it.

Easy to install- Just need a 3" hole-saw, drill, screwdriver. My spectre has been on there for quite awhile- I have only had to replace 1 filter and a 7$ rubber section. Ive been happy with it!