QUOTE(AmeiN @ Oct 30 2012, 06:00 PM)
Wat u do sifu?
Add TRD spoiler, convert GaGa BLM to Vios
Anyway, regarding exhaust mod.
Decat(remove catalytic converter)can release a 0~a few horse power which is not quite noticeable, but the engine response will gain substantial advantage by having better exhaust flow. Anyway, for your information inside the catalytic converter looks like this:
now you have a better idea of why is it blocking exhaust flow, as a result limiting exhaust being expel at full speed, thus combustion cycle slowed down. Meanwhile, removing catalytic converter will release more carbon monoxide and other toxic fume to the atmosphere that contribute to pollution. I'm not being a tree hugger, but I have to be fair to mention both pros and cons for you to justify your action.
Exhaust manifold, difference between 4-2-1 and 4-1 Stock setup is always all cylinder flow into 1 outlet for cost effectiveness and also convenient to join it to the catcon.
According to theory, 4-1 setup will allow better low end speed acceleration due to similar length. However on high speed acceleration, exhaust will bum into each other from different cylinder and causes blockage, as a result top end acceleration is jeopardized. On the other hand 4-2-1 has different length, but each cylinder's exhaust get to expel out at different timing due to unequal length. Theoretically, low end speed jeopardized due to exhaust expelled too quickly, but on high end speed will be better. Some experience modder said otherwise. If you ask me, I'm on 4-2-1, just because you're paying the same amount of money, but you get more besi on the 4-2-1
Anyway, different position of midbox setup will also affect low/top end acceleration. This 1 I leave to other experts to answer. Again I would like to clarify, both my Gabby and GaGa unmod on exhaust system for personal reason
Oct 30 2012, 06:53 PM
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pics of output would be uploaded at our fb
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