right, so I've got a 93' touring, and am planning on adding a 2nd cooler, but do I need the thermostat? or can I just leave it alone? also, do I need to drill anything or get other hose fittings? just kinda unsure how to approach this thing.... thanx

 

You do not need a t-stat, the driver's side cooler has an internal one. What kind of cooler are you adding -- stock or aftermarket?

 

most likely one from baker, it's bout the same size if not identicle....