I have a S4 NA and I´m thinking about modifying my exhaust on the following weeks... And now I´m worried about one thing:

S4 5th and 6th Ports are actuated by back pressure from the exhaust...

SO... If I replase my old stock pipes with more free breething exhaust pipes... Will the 5 and 6 ports suffer on the process ? Will they stop working normally ?

PLZ gimme some advices...

What shoud I remember and know when Ill do the exhaust swamp ?

 

Yes.

The solution is to convert to air pump or electronic activation as shown in the FAQ.

 

Thanks.
Ill do some search for that topic...