That loud grumbling noise when you hit the gas could be your muffler or exhaust system. Over time they wear out or holes are corroded in the exhaust pipes causing your car to be a bit noisier. What most people don't know is that exhaust problems also affect the performance and efficiency of your vehicle. Modern cars are all hi tech vehicles that each system has an affect on the other, your car's exhaust is not different. Same Day Auto Repair can diagnose and repair exhaust issues, including catalytic converters and emission control valves.