Big Bubba From Turbosmart exists because sometimes 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 inconspicuous valve for a small capacity, low boost daily driver, you will need to look elsewhere!Big Bubba has been designed for big horsepower, high performance and high boost turbo and supercharger applications. Big Bubba is, as its name suggests, big, bold and in-your-face.