I have an 86 z28, with a 305 tpi, with the 700R4 tranny. I'm thinking of putting ceramic coated headers, hooked up to either true dual 3" straight pipes, or else a catback system. Does anyone know which one will give me the best overall power gains. Anyone who has done this, please reply and tell me your opinion about it. If anyone has other suggestions for a new exhaust system, feel free to reply also. Thanks.