I have a 2010 Lancer gts and I'm goin to be buying a greddy catback exhaust system for it alone with a test pipe to replace the cat and also headers. Has anyone ever used greddy and can you tell me what you think? I'm lookin to get some power increase and a lower grumble sound not a ricy sound.
first off DO NOT put a test pipe on a N/A car, you will get reversion which will HURT power not help it, but more on that later. The Greddy systems are nice and deep as long as you get the higher end models, like either the Ti-C, or Evo2. The SP systems are really quiet and sound almost like stock. The header is a good choice as long as you don't skimp. Now back to reversion. I will try to explain it as simply as possible. Your cylinder moves up an down in the engine block creating exhaust gases to expel out of the exhaust, as this is going on you have a push/pull effect on the air it is making. The catalytic converter helps "trap" gases from being sucked back into the combustion chamber keeping negative pressure (reversion) from filling the combustion chamber decreasing efficiency at which the fuel is burned, now keep in mind that your engine is sometimes going 6,000-7,000 RPM per minute meaning several strokes per second. On a turbo car the turbo actually acts the same as a catalytic converter because the impeller cannot spin both back and forward at the same time. This is where a high flow catalytic converter comes into play. This would be your best choice.
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