I cored my exhaust removed Cats only ... Cost me $20.00 for welding , super easy mod.
Also istall Rapid Bike race.. Removed Servo Motor .I have about 200KMS on it since install . Bike Sounds aggressive not too much louder than stock. Acceleration is amazingly smoother . I have instant power in lower RPM now, feels like a new bike.
I wanted to share my experience.