if you have electronic 5th and 6th ports can your exhaust....
 

as free flowing as you want it? i know exhaust pressure is needed to activate the 5th and 6th ports on my s4... is there any OTHER reason you would want to have exhaust pressure? reason is was toying with the idea of doing the electronic 5th and 6th ports and just go all out on exhaust that way i get the best of both worlds

thanks
christopher

anybody have a say on this? anybody done it

The S4 car used back pressure to open the ports up, the S5 used the Airpump. I'm using nearly complete free flow exhaust and have no problems with the 5th and 6th port, so yeah if you found a way to open it up electronically, do it and get back to us.

On a side note, right now it says you have 666 posts...scary, lol!

yes but once i rig up the ports to open and eleminate the need for backpressure can i just go all out on exhaust.... or does anything else besides the ports need backpressure?

ive heard that you lose a little low end torque when you open up exhaust, but i never noticed a difference...

a little backpressure is needed to still have some tourque bellow 4000. however, agood catback should take care of that for you.