the best thing you can do for this is to take off centre section of exhaust and drop the whole thing and then you have as much room as you like to grind off the old bolt heads. i would suggest putting on new ones with some copperslip grease (Not normal grease) as this will allow easier removal of bolts for putting cat back on for mot. once you have done this bolt bottom section on first the middle section of exhaust to rear and then bolt back onto turbo under bonnett.
Hope this helps, it seems to be the best way not to trash your hands doing the job.
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