Tuned Mufflers - For Optimum Flow and Improved Sound Invidia's Q300 tuned muffler systems provide quieter exhaust sound than Invidia's R400 and N1 exhausts. While keeping volumes in check, their high-flow design ensures efficient exhaust flow for optimum engine performance and avoids sacrificing any increase in horsepower or torque. Q300 mufflers deliver a rich, deep, sporty exhaust note that enhances the natural sound of your car's engine without introducing unwanted sonic qualities or excessive volume. The Q300 exhaust system uses specially sized resonators and muffler baffles to maintain power output while producing a deep, smooth exhaust tone. From start to finish, Invidia Q300 exhaust systems are designed with performance in mind with the exhaust route carefully selected to ensure minimal bends, allowing unobstructed exit of exhaust gases with minimal restrictions and turbulence. This will improve both horsepower and torque, as well as improve throttle response with reduced turbo lag for turbocharged vehicles. Plus, you get the reward of an aggressive exhaust note.