Atv Performance Exhaust 2004 Suzuki LTZ400??????????? ATV HELP!!!!!! Please........?

2004 Suzuki LTZ400??????????? ATV HELP!!!!!! Please........? - atv performance exhaust

I took my '04 boat LTZ400 from a dealer some time ago and said a valve that was bad. Then I noticed that the results were deadly. I am preparing to change the engine valves. I know it's an escape, and the inlet valve, but it is a motor in each case? or is it more? I know I need to know how much you buy. Do you have tips or suggestions before the task of replacing the valves on my engine?