NA Exhaust help posted by colombo on April 26, 2010 at 11:19 AM
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The NA's are difficult to keep quiet. The Muffler is the major part that will change the sound level. The larger the can and the greater it is packed the quieter it will be. The Magnaflow mufflers are on the louder side compared to others. Big resonators or high flow cats in the mid pipes are going to help, but if you want a big change you will need to use different mufflers.