I noticed here lately that when I go wot and shift I get a very loud pop , like a backfire, car is maintained and kept up , wondering if anyone has seen this, what's your thoughts,

Exhaust leak?
Valve springs?
Tune?
No codes, gas mileage is the same ,no changes on set up,
Thanks

 

Update

On the way home , I unplugged the mass air flow sensor, and let it run on speed density tune , problem went away immediately , so i will replace the maf,

Glad my tuner took the time to tune it both ways.

Thanks again James Short ( Shorts Tuning)

 

Did you try cleaning it?