Wondering what would be best option, currently running a decat system with prodrive backbox and realising that's pretty much the quietest option there is having went through a good few different set ups, I like the current set up problem is it still has the boomy drone at 70/80 you can still talk to each other without shouting over the noise of the car but my kids start to feel sick where as they don't in other cars for long journey's

 

sound dreading might help but you have a lot of options on that side and can get expensive, might be better with a new system.

https://www.deadening.co.uk/

 

Resonated centre will stop that.

 

Think if you swapped to sports cat aswell might stop that. As not noticed that on mine.