FYI don't do it(single stack that is) if you have a regular cab. I double layered my entire cab with Dynamat sound proof and it's still loud and has a drone to some extent. I moved my stack over to the passenger side and it helped a little. I do like the sound of the 4040 b/c it's deep but not to deep and you can hear my turbo alot better in the cab now hahaha
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