GTR PrYdE wrote:I used an air hammer to break the welds. Worked like a champ and only took 5 min
+1 i did the same turned out nice enough haha better than having that battery tray there, im using an NRG cell battery and will be making custom brackets for it to mount somewhere next to the cold pipe.
So to the OP just use a hole saw for sure, make it look clean! id make the hole maybe an inch bigger than the piping then cut a 5/16 coolant hose down the middle and put it around the hole then drill a couple small holes for zipties around the outside of the hole to hold the hose in place IMO that would be very clean.