i must say after reading thru all the six pages ..my knowledge on extractor to muffler going good.....
be logging to this forum ... i did a basic mod on my exhuast
i change to 4-1 . remove the cat , change bullet , 2'' piping n pro 1 racing muffler as the shop owner say it for vios only....
my target is to get low end n top speed and good FC...am i doing the right mod....