When you replace the spark arrestor or resonator with a piece of pipe, a few key things can happen. Find out what happens when you replace the spark arrestor or the resonator with a piece of pipe with help from an expert in the automotive industry in this free video clip. Expert: Robert Holcomb Filmmaker: Alan Mack Series Description: Not every car repair requires you to drop potentially hundreds of dollars at a mechanic's shop - many you can do yourself, as long as you have the right tools. Learn about various types of under the car repairs you can do at home with help from an expert in the automotive industry in this free video series.