QUOTE ("myers4712":1nwb1g64)
Ok but why did your engine blow?
How Rubicon3303's bike still moves amazes me. He rolls it upside down underwater a couple times each ride. It usually just crancks right up and keeps going throttle pinned, and we just sit there shaking our heads...
If you are concerned about jetting, put a new spark plug in when you add the pipe. The take it for a ride, then pull the plug. Check the color. White=lean, brown=good, black=rich. As long as the plug has a good color, and it performs at well throughout the RPM range you should be ok.
Look at it like this an aftermarket air filter flows more air in. An aftermarket pipe (even a slip-on) allows the air the exit the engine faster, flowing more air. With the increased airflow the fuel should be increased as well, to keep the machine running at its full potential.