Anyone know what is the ideal 4-2-1 header for B16 head with B20b block engine. I'm thinking to get the maximum power around 7000-7500rpms. I mean does anyone know what is the diameter of pipe I should use for the header and then also the diameter pipe for exhaust? My engine is pretty much stock and I'll stay N/A in the future. Thanks.

 

one that fits a b16 head

 

if you want more high end power then you want a 4-1 header

 

I can't run 4-1 header cause I'm using PR3 ECU.Means the O2 sensors located on cylinder 1&4 the other is in 2&3.

 

but wait wont they both hook up to the same place they just go into the header and thats where all the exhaust fumes go and i am sure they make one for your car or motor

 

A B16 header will not clear the B20 block.

 

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.

 

right on so i i cna just bolt up headers from a gsr right on that makes my work that much easier thank you das shamoo