Voltz77

I recently installed LT headers on my 85' 305 TPI I replaced the old stock 02 sensor with a newer Bosch one (non-heated) It does idle better and seems to even run cooler with slightly better MPG, However now every time I floor it I get a check engine light, if driven normal or if I press the gas gradually and not to abruptly the light wont come on, the 02 sensor is located on the collector pipe of the driver side header, would you all suggest I try a heated type sensor? I'm not sure if it is needed since it is not on the y-pipe but what do I know??.. Any input fellas???