Custom Air Intake
Zylstra Automotive in Visalia, CA does a custom air filter. Several on the forum have this mod. I have one on mine along with a 4" exhaust.
Last time my van was at SMB West they asked if it was chipped (it is not). I had it done because I was looking for ways to run cooler in the AZ heat as opposed to generating more power. Still runs pretty hot, so not sure if I was successful there...
Current: 2014 15 Passenger V8
Former: 2009 SMB 4x4 6.0