yes the are very expensive to maintain but when u do it right it pays off with all that power...but id rather stick 2 a 2 stroke and change topends every 60 hours instead of adjusting valves every 10....
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2005 YZ250 - FMF Gold Series Fatty Pipe, Titanium 2 Silencer, UNI Filter
2006 YZ450F - White Bros Full Carbon Exhuast, UNI FIlter 
92% of teens have switched to rap music if you are part of the other 8% put this in your sig.
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