Turbo Header

[Civil 0]

Hey Chevy Spark community,

I'm installing a turbo and building a header for the Spark, and am curious what's the function of the 5th runner on the exhaust manifold?

[Civil 0]

Can this fifth port be covered? Is it for emissions only?

[Red2LT 1]

I have seen that too and I am also curious.  

 

I don't have the heat shield on my car, and I have a custom cone air filter with stock airbox removed.  I have all the sensors and stock tubing in place so I don't have any engine lights.  It runs quite a bit better.

 

I would think that port is coming off of engine for some reason but I have no idea why.

 

I was told that can behind the exhaust manifold is a cat converter, and there is a second cat converter under the car with a resonator and then it goes to the muffler.

You probably know all this if you are building an exahust manifold for it.

 

I hope you come back here and update this I would like to know how it turns out.  I am not interested in putting a turbo on this car but an exhaust manifold without that big can on there would be nice.