RRP Exhaust Bottom-Middle Bolts

For those with rrp (or powerfactor) exhaust: How on earth do you tighten the two bolts in the middle at the bottom of the manifold? Very hard to fit any wrench in there.
 
Location
Stockton
This Pittsburgh box 12 mm fits once most of the way in on the rrp. Seemed tighter on Pf though. On both I used this snap on 4 way offset wrench. 12mm headed bolt though, pre started most of the way, just enough out to roll/slide the manifold on.., then fight it with this wrench lol. I remember useing a finger and the tip of a screw driver to try and twist the bolt too before wrench time
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With starter out you can get some room at the bottom to access it but I don't.
 
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