The reason there is leftover fuel is because the car his a rich air: fuel ratio. To prevent the mixture from being too lean and causing problems, a car’s injectors can be programmed to shoot more fuel into the cylinders, causing the rich mixture.
The straight pipe exhausts smoothly, and the curved one blows the ground dust directly, which can cause unnecessary blurred vision to the rear car? Sometimes they bend the tip to keep the exhaust from fouling the bumper, but none of this affects performance.
The Engine Needs Re-Tuning? There Is a Blockage Somewhere? The Silencer Becomes Corroded? There Are Cracks in the Exhaust System? There Is a Leak? The Muffler Needs Replacing? Rust Formation?
