Cupra ST exhaust without the pops/bangs

[Dasher]

I am looking for a catback for my cupra 300 ST (no OPF) that has a modest sounds in Comfort and a deep growl in Sport/Cupra but that doesn't have those pops/bangs all the time? My car has a JM sportcat downpipe and I would like to keep the valve to not wake up the neighbors.

Any suggestions? Looking for 4 round tips instead of the two ovals as well...

 

[Cupra306Form]

The pops and bangs come from the engine management, they inject a bit of fuel on the exhaust stroke. An exhaust wont make this happen.