Years ago, a guy asked me to help him swap in a “Carpy’s 4-1” exhaust on his K4. He also bought a seat, turn signals and a bunch of other “cafe” bits. I agreed to do the work, if I could keep the original exhaust (not perfect, but nice), seat etc…..
Seemed like a good deal until one of the screws heads snapped off an inner exhaust spigot (they had to be replaced with studs). It was behind a frame rail so I had to pull the engine to drill it out!!