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prodriver, thanks again. i was about to order the secondary sensors part#15183 when i read your post. i'd like to see what the length is on the 996 pre-cat sensors, but the bosch part number i find is 17044. this is listed as a 5 wire sensor and the connector looks different than the boxster one from the images i've seen. the lengths of the pre vs. post cat bosch sensors for the boxster are 245mm front and 405mm post-cat. realistically all i need is a 300-325mm length. if the 996 front sensor is closer to 300mm then it would likely eliminate the risk of heater p codes. do you have a part # that i can reference? fwiw i am going to ceramic coat the headers if they are shown to give gains. i also may end up having to relocate a sensor bung further up into the primaries, but would rather not if i can just find an appropriate sensor. thanks.
brad
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