I looked in the archives, I searched but I was unable to find what I was looking for so please don't flame me. I am going to be removing the cats from my 90 GTU and I need to know how to get my 5th/6th ports activated with the decrease in backpressure. Thanks for the help.
dave

 

an S5 uses air pressure fromt he air pump to operate the six ports. Its controlled by a solenoid on the rack... i THINK its the top left solenoid if you are leaning over the drivers fender. So.... Don't remove your air pump.

 

Exactly...

 

your ports will still work if u get freeflow.

 

Thanks,
I couldn't remember which series was run off the airpump.

 

my 5th port is ticking(the one by the firewall), what does this mean? my hesitation is coming back(4000 rpm's). Do i need to replace it?

the shaft goin into the engine is shakey, can move it with fingers!! help me too please, what do i do?

 

I've got a S5 with a straight pipe and it runs great so go for it. Just leave your air pump.