YES Steve,
 The short header tube has the collar (with dog leg or L shape)
 welded to it.
 The exhaust pipe has a collar and small extension welded to it.

 The exhaust pipe is also flared to accommodate the short header tube.
 The L shaped ( dog leg) holds the two together. There would be movement
 between the two pipes which would allow for differential expansion and
 contraction, which I believe is your primary concern.

 This could design could have many variations, like more than one dog
 leg and
 springs, but I've never liked springs around that sort of heat.
 I believe it's a simple yet quite effective design that can be
 handled by
 the novice.

 Here is another by Bill Jepson, if you were concerned about gas leakage.
 Could be considered simpler.
 George (down under)

What a great drawing........

The springs hold up just fine actually, however, if there is a lack of
comfort in that area, flat straps can be used with deformed nuts on
bolts like "Jet nuts" tightened to just touch and no more. So movement
is possible but he joint cannot be pulled open. If very stiff coiled
springs are used, a second hole in each tab is used for a doubled strand
of safety wire run through the spring but left just slack, to retain the
joint in the event the spring would go soft, or fail outright, and then
the spring pieces would be retained on the wire.

Also a more compact joint can have the tabs pass tight against each
other overlapping, and a common hole can share a loose nut and bolt as
above. Have the tabs pass on alternate sides of each other, so you can
still twist the tubing when disassembling it.

The Dutch clamp should be used where disassembly is not a common
occurrence, but still required. Once over tightened, the clamp is
powerful enough to reduce the tubing diameter, and make removal difficult.

Lynn E. Hanover

Lynn,
Did you have to use springs made from X700 or was common spring-steel
ok? On the RX-2 and RX-3 sedans I worked on we used the bolt setup and
never had a problem. Those had an open megaphone exiting under the
passenger door! About a billion decibels. Ear plugs AND earmuffs and it
still hurt!
Bill Jepson



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