When I got my ltr450 I rode it without the cherry bomb... Then installed one, I wouldn't ride it without one after that! Increased rev ceiling, way more power... Wheelied a lot easier. I never removed it so I don't know how to reset it to stock.

IIRC there was a plug (similar to a child resistant safety plug for wall outlets) that went into the cherry bomb plug in when it wasn't installed in the wiring harness.