The Milltek is very quiet on motorways, absolutely no drone at all. I now have HFC's fitted and I only get a very very slight amount of drone even now and that is only at very low revs.
Adam, I was after an exhaust with exactly those requirements. i wanted something that sounded great when you put your foot down, burbled nicely when you took your foot off but was nice and quiet on cruising. The miltek fits all the bills, its great
+2 but with a bit more