Big Bubba From Turbosmart exists because sometimes Bigger is Better! It is a piston-style valve for large-capacity supercharged and turbocharged engines, including diesel. If you're looking for an inconspicuous valve for a small-capacity, low-boost daily driver, you must 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 piston design is an expansion of our traditional BOV5 design, simply expanded to provide big flow and fitment options. Available in Recirc / Plumback: TS-0204-1203 Vent to Atmosphere / Supersonic: TS-0204-1303 Features Billet Aluminium Construction 2.0 Inch / 50.8mm Piston Australian Made, Hand Assembled & Tested Boost-Balance Technology with Positive Seal O ring Aluminium V-Band Fitment Cap Adjustable Spring Pre-Load Multiple Springs Options Available (7,12,17 and 21 InHg)