| I did my research and found that the exhaust note was smoother and deeper if you kept stock cats and h-pipe resonators. You'll notice a louder raspy sound on others where stock components have been replaced. I think it is the way to go, and most others owners notice the difference in the deeper rumble sound of my car! Here is the link to 4 videos... [ http://www.youtube.com/user/wtreb ]
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