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I am currently running a 4” in 4” out Magnaflow muffler in place of the OEM. I welded it into the 3.5" factory exhaust. How much (if any) would I gain by upgrading to a full 4” system? You can see my set up in my signature block. I do a little pulling, a 20” Bayliner Trophy and sometimes a stock trailer. The upgrade would be more for performance than anything else. I am looking at Magnaflow, Sliverline, or MBRP. I don’t want it to loud; I don’t think the noise level will change much from what I running now.
I am deployed in the US Air Force in Kuwait and due to rotate back to the State in two weeks. I just need to decide if a full 4” system is worth the cost. Any input you can give will be greatly appreciated.

Steve
 

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You might see a bit of an EGT reduction but you won't see any drastic performance increase.
 
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