2015 Sierra Exhaust Rattle on MBRP

[leestopher187]

I have a 2015 sierra with 4000 miles. I installed an mbrp catback at about 500 miles. Recently I have noticed that when I step on the gas to leave a stop sign or light the exhaust has a noise that sounds with marbles in a can. Any suggestions?

 

When I removed the factory exhaust that got rid of the flapper valve issue right?

 

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[newdude]

I have a 2015 sierra with 4000 miles. I installed an mbrp catback at about 500 miles. Recently I have noticed that when I step on the gas to leave a stop sign or light the exhaust has a noise that sounds with marbles in a can. Any suggestions?

 

When I removed the factory exhaust that got rid of the flapper valve issue right?

 

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Your MBRP being a catback, you obviously took the factor one off so unless that MBRP has a flapper valve for some reason, you would have no flapper issue. Did you purchase from a shop in town and they installed it? Did you order online and install yourself?

[leestopher187]

Order online and did it myself...

 

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[leestopher187]

Only happens under load also.....won't do it in neutral

 

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[newdude]

Hmm...I guess I'd check and make sure all the clamps are tight, maybe take a rubber mallet and tap on the muffler see if there is anything loose inside. Interesting that its under load when you hear it.

[Imprtkllrz28]

I had exhaust rattle on mine. check the flex part of the exhaust. Mine was touching the cross member on the front part

[leestopher187]

I will check that

 

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