I just installed this x pipe/ full corsa xtreme on a SCAB so I have the extensions for SCREW if someone needs. Literally just made this account to post this, contact me with offer if needed
As for clamps, I was sent a smaller/incorrect size to mount the x pipe, drilled out the weld point on a stock exhaust clamp to remove and use it
... IMO the stock resonator makes the exhaust note sound like a muffled wet fart.
I haven't tried the x pipe with stock exhaust but the Corsa sport was still very quiet to me whereas the xtreme setup is loud at the right RPM but no drone at cruising speed in regular drive mode. The xtreme idles awesome like a V8 / diesel! When you get on it, though quite loud, it does lose bass and reveals itself as an imposter. Overall it still sounds mean.