Putting the battery on the other side sounds like a good idea, but most of the aftermarket coolers use this space to run there cold side pipes, and the battery would get in the way... Rapid has his battery relocation in the boot, and PW has his relocated in the bumper for that same reason I assume.. Nizpro relocates theres to the factory air box location, but that comes with the stage 2 kit $$$, but it does clear the cold side pipes.. For the 'normal' person who wants to keep there car stockish I reckon theres a good market for a kit like that.. I've got a battery tray, battery cables, and airbox ready for the swap, I just need a CAI and I can do it.. The hard part is finding a CAI that will fit as im running a wog cooler, and its tight with the factory cold side pipe and other bits and pieces in the way.. Cheers Mike..