..straight from Jackleg Enterprises..
First and foremost please excuse my v-e-r-y out of practice MIG welding skills. A little carbide bur action will fix everything nicely. I cut the old 4" collectors off with a chop saw and welded up and installed the merge cones..
The collector is just setting in place. All external and visible welds will be done by a professional with a TIG. I'll tack everything in place, waiting for the finish welding.
Again, this will be cleaned up prior to assembly and final welding.
Dave