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That's weird. I spent a day hacking and drilling at one of my DP bolts trying to get it off and messed up the stud a little, but when I got a garage to heat the nut up with a torch it still came off without breaking the stud, and mine have never been undone. I'd have thought yours would have been ok if you only took them off 7 months ago! When I re-fitted the bolts I used copper grease to make them easier to remove next time.
I've now fitted the N55 mids with the PE cat back (without the y-pipe) and I prefer the sound now.
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