337B Turbo IO-360 Rear Engine Exhaust parts

[gcball]

I am in the latter stages of an overhaul on the rear engine and my mechanic tells me that the rear exhaust; header assy., R/L collector, tailpipe, elbow and 2ea bypass elbows need to be fixed or replaced. The parts are damaged and won't pass inspection. I'm told that replacements are not readily availabe except from Cessna (to much$$) and that he has found someone to fix for $3,700.00 plus $407.00 of clamps. This seams like a lot however, I'm told that it's a lot less than Cessna. Any thoughts or suggestions would be greatly appreciated.

Thanks in advance,
Gavin