Here is a pic of my dual battery setup on my 2000 Toyota Tacoma. I had to mod the K&N intake to fit the new battery tray which can take up to a group 31 battery.
I cut the bend off and I had to relocate a vacuum hose nipple. my future plans include a arb snorkel and a K&N apollo intake to make it a sealed but still high flow system. It sounds nice and mean at full throttle. I wish I had more money right now, but I had to get a new washer fluid bottle and that cost 80 bucks. oh well just have to wait till I graduate