RE: Problem with oversized pipe??
You will need a lot of takeoff run.
I did this on an F-16. I was running a P-60 in a 120 pipe.
Take off roll was about 500ft and it was sluggish until after the second turn, then it began flying normally. This was at Greater SOuthwest last year, plenty of witnesses.
Replaced the pipe and it took off in under 300ft