BOV BigBubba PlumBack Valve - SleeperBig Bubba From Turbosmart exists because sometomes Bigger is Better! Big Bubba is a piston style valve for large capacity supercharged and turbocharged engines including diesels! If you're looking for an inconspicous valve for a small capacity, low loost daily driver, you will need to look elsewhere! Turbosmart's Boost Balance System means the more boost you feed this valve, the better it closes and seals It is literally as simple as that. The 2 inch