I concur 100% with Angier about Custom Aircraft Parts.  BTW, they are in El Cajon, CA (near San Diego).

They custom built my cross-over four into two into one system for LNC2 from a PVC mockup that I shipped to them from Tucson.  It has worked perfectly since 2005 and has never cracked or leaked.  This design requires no hangar near the exit.  The only support is the four flanges on the engine.  The #1 and #2 tubes join via slip joint under the sump (so do the #3 and #4). The cross over is under the sump due to forward facing fuel servo. These pairs are then in parallel facing aft on the pilot's side.  There is one more slip joint for the larger exhaust tip to join the pair of tubes.  The exhaust tip (slip joint) is held on by four springs.  The only maintenance is to replace the springs every three or four years.

Tom Thibault

Angier wrote:

As a field repair, the weld repair to my damaged system was good (enough to get me home) but not quite good enough to be a permanent repair.