Originally Posted by badazram
hey guys, so i was looking in to these cats and i can get them with air tubes and without....my truck has the airtubes....if i was to get cats without airtubes, what would happen? i have no clue what the air tubes are for =p i was half tempted to just plug them down by the cats and run cats without air tubes =p just asking for your opinions fellas! thanks in advance! Kev
The air tubes hook up with your pollution pump. Until your engine gets to operating temp the pump draws exhaust gases and recycles it through the intake via EGR valve. The air tubes are not a necessity for your truck to run properly, but don't plug them. But if your inspection mechanic wants to be a dick, he can fail you for them not being hooked up.