I just got a Non Res, Valved Milltek albeit second hand, fitted to my motor 2 weeks ago and it sounds the mutts nuts. They retail for around £1700 I believe with the valves. The Exhaust I got is 2 yrs old and I got mine for £500 plus £50 fitting. In all honesty though, nothing to do with the quality of it, the quality is top notch and "yes"..it sounds awesome but I expected "Louder" from a "Non" res system... the difference sound wise between the standard system and the Milltek....just doesn't justify the price tag. If your thinking about getting one...trust me, the non res, valved system is the one to get...there's only a very slight "drone" around the 2k rpm mark. Motorway Engine speeds are lovely with no drone at all and any other Engine speed..(especially with the valves open) can only be described as...Very Pleasant.