Will a Redback 2.5" Catback Exhaust designed for the XR6 fit on the XT model?

I have a 2009 FG XT sedan and i have found the exhaust system described above which claims will fit in the XT. Only problem is that the rear bumper is significantly different to the G6, G6E and XR variants, would it involve welding on dropped tips or cutting a larger hole in the bumper?

I'm doing the install myself and id hate to buy the bloody thing then realize that i need a welder.

All info greatly appreciated as i couldnt find anything elsewhere.

Link to product: http://www.veonline.com.au/p-2275-ford-falcon-fg-xr6-sedan-2-12-redback-catback-exhaust.aspx