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Does anyone have the 4040XL with built in resonator? I talk to Aero yesterday and I was told that the performance gains between teh 4040 and 4040xl are exactly the same. Their built in resonator is not restrictive, I guess.
I have a Megacab which has a resonator after the muffler but I am looking at the 4040xl. I want the performance but like it quiet, stock sound levels. I was told the 4040xl will give me a lower rumble and be just slightly louder than stock.
I know everyone may think I'm crazy but I'm not into screaming turbos and exhausts that set off car alarms.
I'm looking for anyone that has the 4040xl or just feedback on Aero.

thanks
 

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