Hi toymods, I'm from the Philippines, i drive a 1990 toyota corolla with stock motor 4af, a 16valve 1587cc carbureted engine. I plan to improve my exhaust system, from headers, downpipes and muffler. Can someone help me with this, has anyone done a complete exhaust system for this motor. I need your thoughts and experience on this. Thanks in advance! more power to this group!