a properly tuned length extractor does not compress the exhuast gas from 4 pipes into 1 pipe... the length of primary and secondary pipes are tuned so that the exhaust gas pulse can travel one by one into the pipes according to ur engine firing order...
After all the topics about performance parts and crazy mods... there is one thing about lancer/evo that we always tend to miss out...
besides the mods.. lets list down some other parts of the car that we need to...