Went to NAPA and they had the 2, 45deg elbows and a 6ft section of straight for the exhaust on the motorhome.
Only used 16 inches of that straight pipe.
The 2 elbows, the straight pipe, and 2 clamps cost me less the $80.00.
If I could have gotten the tailpipe from Freightliner or Fleetwood. Think I would have been paying close to $200 for it.