I am doing a custom exhaust on my GSL-SE, and have a RB single outlet header, and a pre-silencer.

My question is, would a custom exhaust still open the 6th ports? The pre-silencer is equiped with the air supply tube, so I was wondering if that's all it needs.

The system is not an extremly high flowing exhaust, since it will just be a single 2 or 2 1/2 inch pipe.
So backpressure is there.

And a side note...
Is there such a thing as mechanical 6th ports?
Where you control when they open and not the backpressure.

 

you would need some sort of air pump

 

yes you can mech six ports, not sure how (its controlled by a vacuum solenoid valve i believe, just like the 2nd gens).
and i do believe your exhaust wont hurt it because its vacuum controlled. dont take my word on that though.

 

Yes, that is all.

 

Thank you!