I think Jerry is right on with this muffler design. It is easier to weld up
and uses up only nine inches outboard of the engine and nine inches below
the pan rail. Assuming the MM hard points on the firewall are at least
30 inches apart and the motor plate rubber bushing center to center
distance is 30 inches this muffler should fit.

The design shown uses two 90 degree two inch diameter
tubes on a three inch center line radius and two 180 degree bends on
the same center line radius. These can be had at low cost from RB Wagner.
The tuned length of this particular configuration is 32 inches.

This particular version may get in the way of tailwind and RV6 type tail draggers
as the diagonal bracing to the landing gear socket tube may interfere.
That still needs to be investigated.

BTW there is one tremendous advantage of Rhino 3D over a full scale
under cowl mockup. It usually takes some buying of expensive equipment
like HKS turbo manifolds or pipe bends to make a full scale mock up.
If you can get a drawing or sketch of the part and you have Rhino 3D
you can try before you buy,

Paul Lamar

I am not doing too good this morning.
Make that:  

It is easier to weld up and uses up only nine inches outboard of 
the engine and six and a half inches below the pan rail.

Paul Lamar
 
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