If I had to put a number on it, I'd say 20-30% louder. It's not as loud as some of the more aggressive systems on the market, but I thought it was too loud for my taste. Again, taste is an individual thing. If you're deciding between the two mufflers, have the shop test-fit them to the car and try them out. After you decide, then they can weld the muffler in. That's what we do at Ed Hanson's Muffler Shop, anyway. Hope this helps.Out of curiosity how much louder would you say it is?