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Exhaust Not As Loud As Normal On Cold Starts

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I have a 2017 Silverado 1500 with the 5.3L. It has flowmaster super 10 exhaust with 3rd cat and resonator delete. Truck used to be so damn loud on cold starts. Last few months it starts as if it’s been driven and warmed up. It’s currently at the exhaust shop for a manifold leak I determined. If that don’t fix it and bring it back to life what else should I look at? 

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10 minutes ago, Snowcamo said:

Lol. Not really wanting to louder. The super 10 was insane enough before something happened. It’s like there is restriction of air flow somehow. Not sure what’s going on. 

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Maybe you got a cat starting to clog? That might explain the manifold leak due to back pressure

Edited by richard wysong
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