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Drivability concern -- after new exhaust

HBSean

New Member
Joined
Mar 15, 2018
Messages
5
Hello all, so I am wondering if this is just something in my head. I have a 2011 Avalanche and I put a Flowmaster Super 50 muffler on it about 30000km ago, it has great sound as the truck almost sounds like it has a 6L when it is only a 5.3L so I am happy about this. My issue is I find the truck just seems a bit off like the power is just not there, this may have been an after effect of the muffler as the back pressure will have been reduced. Has anyone else found this to be an issue and what could be done to correct the issue?

Regards
Sean
 
I have a Flowmaster 50 on my 05 too. Installed almost 2 yrs ago. I never noticed any difference in how the truck runs. Jusyt sounds gnarly. And still roasts the tires off just fine.
 
Hello all, so I am wondering if this is just something in my head. I have a 2011 Avalanche and I put a Flowmaster Super 50 muffler on it about 30000km ago, it has great sound as the truck almost sounds like it has a 6L when it is only a 5.3L so I am happy about this. My issue is I find the truck just seems a bit off like the power is just not there, this may have been an after effect of the muffler as the back pressure will have been reduced. Has anyone else found this to be an issue and what could be done to correct the issue?

Regards
Sean
Could be your just noticing the AFM kicking in now with the louder exhaust.
 
Switching to a Flowmaster will not make a performance difference in either direction. Just sound better.

Had one on my Av for 315K miles with no issues. Im betting you are noticing the AFM as mentioned above as you can
now hear it happen..
 
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