Sound wise its louder and pops and bangs more
, but is quiter on the motorway than the non res milltek. I dont understand how but it is
On the perfomance part, im not sure as ive turned mine down to boost 6 timing 5 fuel 9 until the clutch is done. As soon as its out the way i'll turn it back up and see if there is any difference.
The pipework has less bends than the milltek and is 3" all the way so may get a bit more top end power.
Come and watch if your off ben