well i finally got round to fitting the exhaust today..
after 2 weeks of soaking in wd40 and GT hit it with an impact gun and the nuts span straight off,, thankfully..
mind you took me rest of day taking off the rest and fitting the new system.
still fitted well,, only trouble i had was pushing on the new rubbers that support the exhaust.. i guess there is a nack to it,,
I started on a low setting in the hope to avoid winding the stud off as well.. seems my non penetrating wd40 did the trick lol