Hello,
i bought a downpipe and presilencer... but if i replace the cat, i would need to disable the split air pipe, no? How do i do that? how do i cover it? the downpipe did not come with the split air pipe cover
Thanks
-Ross

 

If you're removing the cat, then the entire secondary air injection system is redundant and can be removed. That includes the air pump, air control valve, silencer and split air pipe.

 

unless he has a s5, and then actuating the vdi and aux ports would be a problem without the air pump and acv

 

The split air pipe connects directly to the lower intake manifold. He is referring to blocking off the hole created there when the pipe is removed. You can just fabricate a plate to put there. Just make sure to seal it well.

 

Sorry, cant remove the emissions. I plan on swapping the downpipe/presilencer for the stock system once a year... either that, or having a cat built to properly suit the system.

Are there cats that you can buy for the racingbeat exhaust system?

Thanks
-Ross

 

I believe he has a turbo, so that won't be an issue.

 

I have an N/a but you can just leave the hole as is and then put it back in for testing. I have had no trouble like this since I got my exhaust.

Santiago

 

I know, but without a cat the whole lot's redundant and can be removed. If the air pump and ACV are removed you don't actually need to block the split air pipe hole. But since he's going to keep it all, you're right, a block-off plate is all that's required.
I made mine (before I realised I didn't need it) from a small scrap off 3mm aluminium. Trace the shape of the flange onto a piece of paper to use as a template, cut it out with a hacksaw, drill two holes and slap it on. Cakewalk.

 

That must be either a S4 or Jspec difference. Because on my car, the Split Air pipe is entirely seperate from the ACV, and there was a big hole there when I removed it.

Unless of course, that hole only leads to what has already been blocked off by the ACV plate, in which case I guess I wouldn't need it. Come to think of it, that is more likely how it works.

 

Well the whole reason of leaving the split air pipe is so that I can swap the exhaust once a year for emissions purposes :P

 

But the split air pipe is attached to the cat...

If you are taking the exhaust out, the split air pipe will come out with it. I don't see where your issue is then.

 

No it wont. Split air pipe attaches to the cat, but you can unbolt it there, can you not? So wouldn't it be venting to the atmosphere, dude?

 

Why not just take off the split air pipe too? It isnt any more work to add onto removing/installing your cat. Block off the split air port on the intake manifold and when emissions time comes, put everything back on.

Chris

 

Doesn't that involve removing the ACV?

I guess my question is, could i just leave the split air pipe hanging there? or do i have to make a cover plate for it to block it off?

 

The Split Air Pipe end, found at the Manifold, could be removed freely, along with It's hose connection and not even be capped off.

 

Perfect! that's the answer i was looking for
thanks guys!!!

 

You are correct.