Hello All,
I installed a used Cat Back system with an H-pipe crossover. 2015 GT
In 6th gear when the RPM's drop below 1900 or so, there is an extremely loud annoying "Reverb/Drone" sound in the cabin.
It goes away upon acceleration or deceleration or if I downshift to 5th.
Could this be inherent to the H-pipe design ?
Anyone else experience this ?
I wonder if the X-pipe crossover would be better.
I welcome all ideas and suggestions.
Thank you