Hi Red, Welcome to the forum. This topic has been discussed many times, try the search feature and it will return a lot of relative responses like this one found with the search term +milltek +powerJust Picked up my new S5 trying to get feedback on the milltek exhaust is there a power increase or just a different sound
You're quick on the draw erdff!!Check out this thread...
MickeyT did a great job giving us all a good reason to get the Milltek exhaust!