I've ran MBRP on all my trucks... best sound in my opinion... I get LOTS of compliments on the sound... especially from old muscle car guys... I have MDS turned off so there's absolutely zero drone... I don't recall there being drone when MDS was on but it was only activated for like a week before I shut it off...
I'll say that MBRP has the best customer service too... the first kit I bought off them was aluminium and only had a year warranty... after two years of owning it, there was a small hole in the muffler so I called them up and sent them a picture... didn't expect anything but he sent me a new one out free of charge... I've been a loyal customer ever since...
... and yeah, that MBRP sound... pure sex... nice deep, throaty rumble when you fire it up and at idle... great sound cruising but when you go Wide Open Throttle, it SCREAMS!!!