Upgrading your exhaust for your vehicle is one of the best upgrades you can perform. Most stock exhaust do a bad job of getting your exhaust out properly, so modifying it correctly is very important. Do you go dual or do you keep the single setup? Dual can be great for older vehicles or race vehicles that you step on the pedal to get to the finish line, but are not concerned with economy. Testing has proven that a single exhaust configuration on current stock vehicles is the most efficient. One muffler setups have been engineered to utilize the computer in modern day vehicles. It’s really the computer that controls the show by optimizing fuel needed to propel your vehicle. A single exhaust accompanies the controlled pulse which is created by the computer and maintained with a smaller total output diameter.