Here is full shot of the scoot
Yep - I see your problem.
When you're running even a stock scoot you have to be able to keep an eye on the oil level.
Up, down or out - that set-up needs to be moved.
Bend the pipe at a muffler shop - but what would that do to your frame mounting; use the stock pipe with your new can - get some movement to off-set it more?
You can't be the first to run into this issue with these "Fits everything from a Sears mower to a scooter" aftermarket jobs.
I would look hard at some 50cc forums. These guys are fitting these Leo's to all kinds of 50's. (on a 4T I understand you get more noise which is interpreted as more go - real changes are on the 2 cycle engines)
If you can use the oil dipstick "cap" only as a thread-on cork - and use something else to stick in there to check your oil level....cutting off below the cap. But if you can't even get the cap off - that won't work.
Everybody keep thinking here....
Stig