I would definately stick with a "cold air" type replacement. An open air element is compromised off road and actually may result in a power decrease in traffic and around town when airflow around the motor is limited. just put "cold air intake" and Toyota 3.4 in a web search and see what you get and go from there. I think will go with the Volant when the time comes. It looks like the best part out there. Should give a good boost and maintain off road ability.