Absolutely sure they are friction fit. I removed one of mine to try and adapt a carbon fiber tip I found but the inlet diameter was too small to fit over the exhaust tube (once the tip had been removed).
Tips are easy to take off but a little trickier to get back on straight. Just need to tap carefully and with equal force so that it doesn't get misaligned. It was no problem and about a 10 minute job without jacking up the car.
Let me know if you are successful in finding a shop that will fabricate new tips for you. I've had a hard time finding the right diameter and even harder to find the right length. (Sounds like a bad party joke)
Good luck
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