where ur back box is now . u could use the mount there by weld a hanger from the new on one cut the pipe back to allow a enough room for a flexi pipe joint from
www.demontweeks.co.uk for 25 quid but they do wear
and retain the normal exhuast system from the manifold to the point where u cut it.
or have a s/s pipe bent from the middle box.
you could have this done at
www.essexracing.co.uk fitted your lookin at 50 quidish
if u fancy building yourself use
www.jetexexhaust.co.ukthey have every bit u need
it all depends how hands on u are and tool to use . u have