People shouldn't get twice pipes if they don't want their car to be loud lol. Its louder than a flowmaster, turbo muffler, magnaflow etc BUT if your car is efi like mine is, it really isn't that bad. My buddy's 240 with triple carbs, 2.5in piping to an Apexi muffler is slightly louder than mine. Another buddy's is triple carbs with the twice pipes and his is louder too.
Do your research and worst case scenario, you're down a couple hundred bucks