4" is a restriction on a healthy 4xx motor. just cause the TB is one size doenst mean the air track to it is of equal flowing. Like anything else your breathing your a straw, the biggest it is the better its going to flow. bends and length effect flow seriously
Quote Originally Posted by RedHeartbeat View Post
how big of a throttle body are you running? 4" tube should easily support a 102mm TB since they're both the same size, right?
dual 4" running to each side of truck and behind the headlights or down under neath the bumper with scoops to get fresh air