Might be a stupid question but do you know the difference between the standard evolution system and an 'open valve' evolution system? Just came across this on the Akrapovic website...
https://www.akrapovic.com/#!/car/product/hot hatch/798/sound?brandId=16
The open valve system obviously sounds better!
https://www.akrapovic.com/#!/car/product/hot hatch/798/sound?brandId=16
The open valve system obviously sounds better!