exhaust downpipes yes or no ?

[red98]

3 nuts off and the studs look good,soaked the other 5 in wd40,another 3 are loose and i think they will come off this evening without any problems    that leaves the middle two,cant budge them at the moment and i dont want to break the stud....the top one of the two i can reach with my angle grinder, fitted with a new cutting disc there is room to slice one side of the nut,two if i have two,the other is lower and harder to get too...can get a hacksaw blade in there but that will take a while  :\ .....better than breaking a stud though