Call Corsa direct - I think there is a issue - but it is small. They have good customer service in my opinion. FYI I have the Corsa on my 07 N* - no real change in performance or fuel usage - maybe harder on fuel now - just so I can hear it. The sound at idle is not the best - but rev it past a few thousand RPM or pass someone on the highway - you will be all grins
... I have had mine on now for 2 years - no regrets - maybe louder than I thought it would be but unless you are really on the throttle - not to loud. Also fit/finish is excellent - did the install myself with the only aid of a resip. saw with a good SS cutting blade... good luck..
