I have a magnex 6x4 universal b/box mated to a standard 16v system. Its almost silent on tick over, and makes a bit of noise when booting it, not too excessive though-can still hear the airbox roaring away as I like it! Its ever so slightly boomy at 60/70mph crusing in 5th, until the throttle is touched. Basically its as close to how I want it as I reckon it can get. I did have a scorpion dtm backbox on it before, that was almost silent, and not boomy at all, which is really what I'm after, but just wasn't too keen on the style of tailpipes... I would like the performance of a free-er flowing system + fanimold, but not at the expense of the car sounding like every other chavved up motor out there. I want an almost silent stainless system that gives a nice gain. Too much to ask for I guess!