Miltek cat back non resonated fitted

Right just fitted my miltek cat back non resonated to my 3.2 now the sound is a great improvement you can here the little blip on the dsg down shift its great, however, I do a fair bit of motorway driving and noticed today when driving about at 60ish quite a drone not yet been on motorway with the new exhaust but wondering what those with the miltek think of the noise when at motorway speeds? I does boom and I was warned of this just need to work out if I can live with it?

Any thoughts welcome.

I only went for it as i got it for a really good price I'll see how I get on if I don't I'll pop it off and sell it.

I like the noise don't get me wrong it's the residual noise you get at about 2500 revs inside with the windows shut and you can barely hear the stereo but as I said I'll see how it goes.