the spark arrestor is the metal screen mesh at the end of the exhaust. it restricts airflow. it should make it sound slightly deeper and give it a little bit more punch
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-Josh My Ride:
ASW Carbide
Mods:
Dr. Pulley Hit Clutch
FMF Slip-On Exhaust
No Rev. CDI
Uni Air Filter
130 Main jet
1500 RPM main clutch spring
11g sliders
75w Halogen Headlights
CARBIDE!
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