"smooth" sound from an N/A? LOL.... no. They'll always sound like a Honda's big daddy with gas. A deeper or throatier tone can be accomplished with a better design of resonator (removes the fart sound.... it's there... even if you don't hear it from the driver's seat) and a GOOD straight through muffler. Larger diameter piping causes more of an increase in volume than drop in tone, IMO. My preferred combination is an AeroTurbo resonator (a NO RESTRICTION Helmholtz resonator) and Borla muffler. Don't go larger than 2.5" on the piping. The header has the LEAST affect on the sound of the MKIII's exhaust.
__________________
If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum.
If you're so inclined I'm always more than happy to accept tips via PayPal. 
Tip Jar ---> 
|