I've got a new fuel filter floating around my cargo area waiting to be installed, but the air intake mod sounds like a good idea too. My husband and I have been throwing around the idea of changing to headers on both the vehicles as well but he's been a bit more hesitant with his because we just plopped down some cash to install new cats on his 2006. (Fun install, cold day!) A transmission cooler is also on the list to hopefully fix the issue of foaming while under moderate to heavy load, despite several fluid changes. It always occurs on steep mountain climbs on the trails in Ouray and Silverton, doesn't happen during steep climbs on paved roads or the trails in Moab. If that doesn't fix it, I'll be facing a transmission rebuild.