since the topic an this thread is all about exhaust power, I just changed my pipe with 4N pipes. I can say that it made a very big difference. I tested the power and my bike reached 140 kph. damn! and all stock except the exhaust pipe. And also the sound it makes, at first its loud but the faster you go, it becomes quieter. the problem is, its consuming more fuel. Any advice and suggestions will be very much appreciated. ride safe guys!