If leaving other cars in the dust is your goal, then leave the spark-ignited injectors behind. How fuel is delivered to your engine makes all the difference in your car's performance, engine noise, and emissions. If you are looking to truly enhance the performance of your car, the most important aspect to consider is a diesel injection pump. You always imagined yourself racing down the road, skillfully dodging the slower vehicles all around you like an automobile version of Frogger, yet in reality, you seem to be the car others are flying past.