That's interesting. So I won't get much noise out of them ?Dump valves you only really notice when you do a pull and back off. Gear change is too quick for them.
2010.What MY is your car?
Go for a resonated y pipe Peye it's what I did and it reduces in car drone at motorway cruising speedsWould putting a y pipe on change the note? I don't want to sound like a boy racer cruising around town haha