blue90conv.

I'm unbolting my exhaust, but the metal pipe coming from the cat and goes into a rubber hose is confusin me.( i'm assuming this actuates the 5th&6th ports) When i unbolt the exhaust what do i do with it, do i just unclamp it from the rubber hose or do i have to do something else? Any help it appreciated.

rx racer

humm if ur putting on another exhaust just let it sit there. Back in the day my friend put on my header and didnt know what it was so he just clamped it shut.( my 5th and 6th ports and carbon locked neway)

i dont think thats very good to clam it tho

blue90conv.

I am going to put on another exhaust but it's gonna take a while to get it, i was gonna drive it without it until then. So its ok to just leave the rubber hose open? I just wanted to make sure it wasn't necessary to keep it runnin.

0pistons

wire your ports open, the low end loss is well worth the high end gains.

Project84

on the S4 (86-88) engines, the tube coming up from the main cat allows back pressure to operate the 5/6 ports. I don't know what exhaust you are getting, but my racing beat exhuast has the tube on it so you can still use the 5/6 ports, but it has a block off plate for the air control valve so you can remove it and the air pump. If you have a 89 or newer car, it works different.

rx7raca

so its the exhaust pressure that works the 5/6 ports?
so i can take off that ap then rite?

1987RX7guy

iTrader: (3)

S4 cars use backpressure and S5 cars use the air pump.



Santiago

1987RX7guy

iTrader: (3)

How do you figure? You gain nothing from it that you won't have with working ports.

To the original poster-Don't cut the hose off don't clamp it. I suggest you get the RB pre-silencer for part of your exhaust this maintains the backpressure needed for them to oppen and it is straight through in design xso you don't loose much in high end. If you don't want to do that then find another way to make them open. You will only loose from havine them in one position. You goine NOTHING from wiring them open you only LOOSE low end and keep the high end all of us have.


Santiago

Black13B

iTrader: (1)

i think 0pistons was referring to the guy who's ports are locked shut..

0pistons

i was referring to thwe locked ports, thanks blck13b

i have a s5 with the air pump removed and a moderate streetport with the 6pi wire open. It pulls hard to 9k and sounds awesomw with a stock exhaust, and its got serious *****!