I've got that set up with a 5" stack and it's loud but not as loud as the striaght pipe. Compared to the magnaflow 4" perf muffler the areo sounds alot better.
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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