Ultra XP Aluminum Fuel Bowl Kit Hard Core Gray Ultra XP Aluminum Fuel Bowl Kit Fits Models 4150, 4160 & 4500 (will Require a .250 Longer Fuel Line) Black Anodized Finish HolleyUltra Xp Aluminum Fuel Bowl Kit. Fits models 4150, 4160 & 4500. (Will require a . 250 inch longer fuel line). Black anodized finish Features and Benefits: Bowls use standard traditional floats, float hangers, screws, accelerator diaphragms, etc Features Clear Pyrex sight windows on both sides of bowl Fuel trough designed in floor of bowl to route fuel directly to jets & assists to keep jets covered Internal baffling cast into bowl 20 percent more fuel