installed corsa single exhaust a couple of days ago and noticed a high pitch whistle above 4500 rpm. at first i thought maybe it was a leak so i tightened everything up again but it didnt help. so i had a friend listen to it on a drive by and he said its definitly not a leak and the whistle is all comin out the exhaust.WTF. has anyone else had a prob like this? what do you think it could be? i emailed corsa about it but they prob be a while getting back to me.

 

For some strange reason Corsa does not return emails. Just call their number and speak to a body.

As far as your whistle, I have no idea. My Corsa system sounds great, especially hitting passing gear under an overpass.