Correct me if I am wrong here.  For the bolded phrase, I thought is the other way round?  Hotbits - increase top speed while Powerzone - increase torque hence increase pick up?

Do enlighten me.  Thanks otai-otai. 

THanks.. Im sure both of u are enjoying the plugs and filter.. 
for apple to apple comparison.. Hotbits extractor only vs Powerzone, Hotbits primary pipe has a smaller diameter to increase exhaust velocity producing the vacuum and scavenging effect on the intake valve, therefore drawing more fresh air and fuel into the combustion chamber to produce more power. However when u reach high rpm the air velocity out of the exhaust valve is high and the smaller diameter hotbits primary becomes a restriction to maintain gas flow.. However powerzone primary tube are bigger in diameter.. In effect low end torque isnt really much improve due to the primary pipe not playing a major role in scavenging, and it solely relies on the secondary tube to create the drawing effect.

As what samwongjyhhorng has mentioned. We LYNPPC did a TT session racing up genting and back down to kl last saturday. It has been proven that hotbits did have a restrictive effect on top speed but providing much better acceleration instead. 

Sorry bro...have not heard bout this brand... May b others have.

---

Added on April 11, 2011, 9:46 pm

Thanks for the information.  Will put Powerzone 4-2-1 extractor in my consideration list when I am ready to upgrade aftermarket extractor. 

Wegow is cap malaysia one.. But the quality seems good.. Too bad its not available easily.
LOL.. U want top end power? 

---

Added on April 11, 2011, 10:09 pm
No lah.. we didnt change to hotbits cos it looks better lah.. We are trying to compensate more for the Campro's poor low end torque.. At high end there we got enough power to tapau the Myvi's and vios'es on the road..