Ron's Fuel Injection has several types of bolt on units designed specifically for racing applications. We have our standard Flying Toilet (the winningest bolt on fuel injection unit) that comes in three sizes for any motor combination. They may also be used in pairs for even more power and air-flow. The Flying Toilet comes in 3 & 3/4", 4" and 4.100". These units are simple to use, fast, consistent and reasonably priced. Our newest fuel injection units are the all billit aluminum construction Terminators and 4-Shooters. Both of these units have four butterflies and are designed for more horsepower, smoother throttle control and compatibility with throttle stops. They come in many sizes and are excellent in dual applications. All of our fuel injection units are racer friendly. They are easy to tune and are very consistent. We have technical support available even on weekends when you really need it. For a free info pack or questions, call Tom at 1-877-233-RACE. You can also e-mail Tom at TOMSCORNER@aol.com.