Originally Posted by
aquito
This one.
http://www.kingmotorrc.com/THOR_Tune..._p/km66056.htm
It sounds perfect not too quiet and not too loud. The one I had on my ksrc001 was too loud with the 23cc motor and when I upgrade to 30.5cc was just absurdly loud jaja neighbors would think it was a 2 stroke motocross bike
Same one I had on my T1000 and my current KM Baja. I think this is the best pipe for the engine.