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...
anyone who just attended a party at oug housing area on 15th feb?
i just wanna know if they are members here, cos as these ppl parked everywhere in my housing area, and sped off when they left leaving loud noises...