NZ01 and NZ02 both include the midpipe and also the rear silencer…
NZ01 is louder – None Resonated Mid - http://cougarstore.co.uk/index.php?main ... cts_id=114
NZ02 is quieter – Resonaded Mid - http://cougarstore.co.uk/index.php?main ... cts_id=113
If you need anymore info drop me a PM...
Welcome to the forum, I think it was marzman who had an issue with the wheels, from memory, the polished lip is attached to the wheels and if this buckles or becomes loose it can cause a vibration…