It is very loud. has great low end and no i dont like the sound. it is a little rattly and metallic. i was hoping for a deeper rumble. its a great pipe though.
Here is what tuning your airbox means. Jets come in all different sizes. just because it says its a 64, doesnt mean its a 64. it could be more like a 72. When i refer to jet sizes i am specifically speaking of actuall BING jets. now lets say you had a 68 in your carb. Do a plug chop (see freds guide) now if your spark plug is a little too dark (rich) you dont need to put in a smaller jet. you can just take restriction out of your airbox and make it "high-flow".
The bigger the jet the more gas/air
The smaller the jet the less gas/air
Less restriction on the airbox the less gas/air
More restriction on the airbox more gas/air
On a stock maxi you can take some restriction out by removing the white hose that comes with the airbox. Stock airbox's such. i recomend making your own with a bottle and different layers of nylon leggings.