I started collecting the parts and pieces for a serious OBA system for the XJ this week. I would love to have a York or a converted Sanden AC compressor, but there's not much room under the hood. I decided to use the space vacated by my stock airbox for a second battery, and use the rear cargo area to put in the air...
Here is the system so far:
5 gallon aluminum tank with 6 ports
Viair 480C 200 psi compressor
Hoses and plumbing for a 200 psi regulator and two quick connects
25ft rubber hose will be stored under the seat for air tools.
30ft coil hose will be left at the output for airing up tires.

I am waiting on the Viair compressor bracket and the 165/200psi pressure switch to complete the install.
I will run the winch and compressor on the second battery and leave the original battery for normal starting duties.

http://www.flickr.com/photos/35459192@N03/8319343197/http://www.flickr.com/photos/35459192@N03/8319343197/ by http://www.flickr.com/people/35459192@N03/, on Flickr

 

so shineyyyyyy