Car: RSP, 1990.
I am replacing the exhaust and original inlet/exhaust manifold casting
It has no catalytic converter.
I found a small outlet on the manifold casting connected to the airbox (original RSP one)
I guess this is some emission control device to allow more air in on over run. Haynes is unhelpful.
The Minispares Inlet manifold I am planning to fit has no take off there , nor does the Maniflow one.
What is it?
Is it OK to leave it disconnected?