Originally Posted by mr.crx
then what the hell are you supposed to do will a b18 header i have been trying to figure out what headers fit a b20b and nobody seems to know one person told me gs-r headers would fit but arent those the same as b16?
All B-series exhaust manifolds use the same bolt pattern. The only difference is the B16 header is shorter because the block is shorter than the B18 or B20 blocks.
Also, you have to take into consideration the cat location. 94-99 GSR exhaust manifolds don't have the O2 sensor in them, but the 00-01 GSR and 94-01 LS do. The exhaust manifolds with the O2 sensors in them have a longer collector to compensate for the cat being farther back.