Just wondering if the 4-1 headers from the civic Si would fit onto the B18B. My O2 sensor is bad and I found someone selling a set of the headers from the 2000 Si WITH the O2 sensor for cheap. I will probably have to modify the O2 sensor since the wiring is probably different. But I want to know if it will bolt on to the B18B. Thanks a lot for any responses.

 

why dont you just get a new o2 sensor?

 

I am thinking the Si Header may be a little better than the B18B's. Just a thought I had.

 

stock header fro $200? thats kinda of high dont you think? for a little more you could get a aftermarket one and the sensor is about $80 (bosch makes them).

 

I never mentioned any price for the stock header. I said it was cheap..... and I mean like 45 bux cheap............................

 

i dont think you want to put a Si header on your 1.8L...they were made with intention for a 1.6L and they probably have smaller primaries(flow less than b18b header). call the company of whatever brand the header is and ask them if the primaries and secondaries are different from the b18b header.