Had a think about this. This is what I reckon:
1 - take pic of XR650L engine with Powerbomb header.
2 - draw round header.
3 - take pic of Dommie engine with stock headers
4 - *very* crudely register it to the XR engine shot:
5 - overlay the Powerbomb outline on the Dommie engine:
Looks to me like I was right - the routing by the frame spar is not the same. On the plus side, it does look pretty close, within the tolerances for the rear exhaust joint.
Any ideas would be great, before I splash out on the hardware.
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