That if you install a HellCat air box without the air tube that it sounds like a big block Dodge with a 14" x 3" open air cleaner when you stomp down on the loud pedal. The "open hole" still gets plenty of air thur the grill and head light openings. I know some will say why not put the tube on??? Had it that way before I traded the R/T off.....bought it back, couldn't stand it. The air box gets too dirty for my liking. So I tried it without the tube, love the sound.