Ok, since buying my 4Runner yesterday, I have installed a valor exhaust tip, 20% tint on front windows, replaced sport shifter with limited leather shifter, installed cargo envelope net, first aid kit, and emergency roadside kit. Next is Revos and seatcovers. But, I was also thinking about an aftermarket air filter. So, is the K&N or Amsoil air filters worth it? Benefits (if any)?