Yay, more Aussie Z4M owners coming out of the woodworks!
Have you guys heard of M Club Australia? Look it up on Facebook and join up. There are a few Z4Ms in the group so you might find someone interested. You'll also get invites to some of the awesome runs and events they put on
I bought my car with an RPi exhaust and promptly swapped it with another guy for his stock exhaust. God I hated the RPi! I've since got my hands on some 340i exhaust flap actuators and am about to fit them just before the mufflers so I can choose either stock and quiet or straight pipes with the flick of a switch!
If I didn't have those plans I'd be interested in the Diablos. Why are you moving them on Caosa?