I own an 04 for ranger extended cab. ive got two cvx 12's in a slot ported hand built box, and a 2400 watt 2 channel amp, but i dont get much airflow under the box for my amp. if windows are down, no problem ,but more than 5 minutes of idling with the windows up and it shuts off(mosfet) any ideas for cooling my amp with the port but still have the subs firing upwards?