I bought a Gibson single exit exhaust for my 21' X3 Turbo R, their website says that it will produce 93 decibels of sound. I bought a decibel meter to double check that because it seemed much louder. It read 115 db's lol. I bought a second meter (different brand) to make sure it was accurate and it read the same. I did install a cat delete pipe before hand so that may be why it's so much louder. What do you guys think?