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You might be referring to overrun, the burble and popping noises you get when downshifting and slowing down?
Backfiring is bad for your car.
I am sure this is what he is talking about. He just don't know the diff's.To the OP here yes it will still do the sound that you are talking about but just a little louder. I have npp and also have borla akta system on my 2014. Robert
Last edited by robert miller; Jul 1, 2016 at 01:53 PM.