hi guys, was talking to this workshop boss who'd just done a turbo conversion on an Optra. No pics, sorry - but I've personally seen the car and taken a ride in it.

The exhaust manifold on the DOHC engine has a little extension on the right side of it (don't know if that's called cylinder 1 or 4)... see pic:



and that little extension apparently recirculates exhaust gasses back into the engine to keep things cool.

Does anybody have any information on this, like is it just a groove lathed into it on the connecting side or any pics of the bit?

And how would that D16 header from the Civic fit into the scheme of things?

Thanks!!