These air cleaners cleverly hide an LS drive-by-wire throttle body inside to maintain a low height and classic looks. Utilizing a hidden opening in the base to hide unsightly wiring from the throttle body, this trick air cleaner allows you to experience all the benefits of modern technology and keep the vintage look you want. This virtual kit pairs it with 4150 adapter 17-93, Holley intake manifold 300-137 for LS Cathedral Port engines, and Fuel Rail Kit 534-219 The opening is 92mm but any 4-bolt pattern LS throttle body will physically fit. We recommend the LS2/LS3/LS7 style but the L33, L76, and L92 should also fit. All virtual kit part numbers in this series: VK060188 - LS3 DBW Chrome Air Cleaner (120-500), Adapter (17-93), Gen III Manifold (300-137), Fuel Rail Kit (534-219) VK060189 - LS3 DBW Chrome Air Cleaner (120-500), Adapter (17-93), Gen IV Manifold (300-136), Fuel Rail Kit (534-218) VK060190 - LS3 DBW Black Air Cleaner (120-501), Adapter (17-93), Gen III Manifold (300-137), Fuel Rail Kit (534-219) VK060191 - LS3 DBW Black Air Cleaner (120-501), Adapter (17-93), Gen IV Manifold (300-136), Fuel Rail Kit (534-218) VK060192 - LS3 DBW Dual Snorkel Chrome Air Cleaner (120-520), Adapter (17-93), Gen III Manifold (300-137), Fuel Rail Kit (534-219) VK060193 - LS3 DBW Dual Snorkel Chrome Air Cleaner (120-520), Adapter (17-93), Gen IV Manifold (300-136), Fuel Rail Kit (534-218) VK060194 - LS3 DBW Dual Snorkel Black Air Cleaner (120-521), Adapter (17-93), Gen III Manifold (300-137), Fuel Rail Kit (534-219) VK060195 - LS3 DBW Dual Snorkel Black Air Cleaner (120-521), Adapter (17-93), Gen IV Manifold (300-136), Fuel Rail Kit (534-218)