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Added on January 15, 2011, 10:33 amPoisoned kaw kaw.

Went to STY exhaust, 3rd mile Kuching to survey the headers GOT POISONED BIG TIME and ended up getting one. I have two choices. One, was to get the older design which is 4-2-1 also but the way the primaries meet up with the secondaries are in different config than the newer version whereby cylinder 1 and 4 shares the same secondaries and 2 and 3 cylinder shares the same secondaries and the O2 sensor is at the 3rd cylinder reading. The new version is the o2 sensor is located at the bottom end of the secondaries. Config of the new version is cylinder 3 & 4 goes into the secondary, 1 & 2 cylinder goes in the secondary. So meaning, the newer version have better flow out of the engine cylinders.......following me so far? 

So anyways.... summary is.... i got these:
1. 4-2-1 header - RM300
2. Top Cat mid box replacing the original unit. To reduce metallic noise after installing header. - RM180

Results:
Lighter engine feel. More willing to accelerate. A bit of "zingy" noise at the header which is normal. Engine sounds less stressing when accelerating (its quieter actually, less of the engine roar noise.
Pics!!!!!!

The 4-2-1 header. Design is copied from Super Street headers. The other is the midbox from Top Cat.




Before


Pic showing the valves inside the exhaust port


Dismantled


I killed the CAT (catalytic converter)