OK ..First THANK YOU to all that helped with my spaggetti wiring issue...Ready to move to the next level....Yellow A/C F 18 twin...Alignment of the Bifucated pipe to frame and engine....I have basicly built a couple of doughnuts at the rear which should center the thrust tube in the AC openings.... HOW do I know that I'm fairly STRAIGHT in the forward end (single opening) of my pipe alignment to the end of the engine ? I believe that I am to leave about a one inch gap between pipe end and engine end. Same on the intake end aprox 1 inch...pipe
My theory is that pipe should be level to thrust line of the aircraft, to eliminate adverse pitch trim. So engine needs to align to the level exhaust so that thrust is straight thru the pipe and not cocked or tilted. I am working with prior engine mount but no brackets or formers to attach my bifucated tube.(except as noted on the exiting end) HOW CRITICAL IS THIS ? I understand that you can burn up a pipe(TAMS and P-180) if exhaust is not centered

Could it be as simple as looking down the exhaust and eyeballing the exhaust to the engine ??

Sorry I don't have my camera here to give a clearer image.

This plane was turbine by first owner/ converted to twin electric by second . Now going back to turbine by third (me)

Appreciate the education


Bill