Many Accord 4dr are available. New DCS Exhaust improves performance by using a more free-flowing system. A great way to upgrade your car is with Accord 4dr. Finish off your custom project with new DCS Exhaust. Trick it out with improved Accord 4dr. Step on the gas and listen to your new sound with DCS Exhaust. DCS Exhaust provides gains in throttle response and overall performance.