Replacing the Aero Kit Exhaust Trim/Extension

[trapdoor]

Hi all,

I managed to get a dirt cheap brand new exhaust trim piece from fleabay as mine has become all corroded and one of the chrome trim bits has a dent.

Anyhow, on the trim, there is a metal bracket welded which looks like it goes up behind the bumper somewhere.

Can anyone tell me how to go about replacing the trim? Does the rear bumper have to come off to get at this mounting? I assumed when I bought it that it was just clamped on, but having a good feel around the fitted one, this bracket goes up behind the bumper and attaches to something? Anyone got any instructions for removing the rear bumper etc?

Thanks.

Mark.