Synergy 5017 - 2012+ Jeep JK Exhaust Spacer Kit - Manual (Page 3)

hammer with a chisel end works great for this. However it can easily be removed
by hand with a hammer and chisel if an air hammer is not available. See image
3.1 and 3.2 below for before / after reference photos.
Image 3.1 Exhaust rivet location
Image 3.2 with exhaust rivet removed
4) Next, we can remove the stock bolt attaching the exhaust flanges at the factory
cross over pipe to the exhaust manifolds. Use a 13mm wrench for removal.