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What is the tube connected to the catalytic converter for

I did a search but could not find anything. I am replacing the stock muffler and catalytic converter on my 86 with a B&B muffler. When I removed the old system there was a tube connected to the cat. My question is what is this tube for? I am guessing it has something to do with the air pump but not really sure. Also if I remove it how do I plug it up?
Thanks

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86 930 Grand Prix White
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Old 04-11-2013, 01:06 PM
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It is a part of the air injection system as you surmised. Is your air injection system still working? If not, there is no reason to plug. I am sure that others will chime in but if running an aftermarket exhaust you might want to at least remove the belt off the pump...
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Old 04-11-2013, 01:21 PM
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Thanks for the reply. Yes the car is all stock at this point and the air pump is still working I want to remove it but that will come later. Should I remove the belt for now until I get around to removing everything and plugging the holes? It seems like to remove it properly the left side exhaust has to be removed and that is not something I want to do laying on my back.
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Old 04-11-2013, 01:27 PM
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As JP alluded to, the intent of that line is to inject air into the cat in order to heat it up more quickly. You can just leave it open to atmosphere if you want and it won't hurt anything . . .
Old 04-11-2013, 01:39 PM
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Thank you guys
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Old 04-11-2013, 01:47 PM
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That tube is part of Porsche's "special wishes" program. It's called the (well, I can't spell it in German) but provides additional boost by recirculating some of the exhaust pressure from the cat back to the intake of the turbo. Supposed to gain a bunch more newtons of force or something like that (call me if you want to discuss further, I also have some swamp land for sale real cheap).

Funny, I don't recall my cat having one on it, but then it's been years since I took the whole damn thing off. All the air pump 'save the environment' stuff is off as well, so for me it's a moot point. Plug it, forget it.
EDIT: So you forced me to go digging through my parts. Yepper, my cat has a tube as well, and it's plugged with a threaded bolt screwed into it. End of story.
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Last edited by mark houghton; 04-11-2013 at 08:02 PM..
Old 04-11-2013, 07:52 PM
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It's part of the emmission control system. We plug the remaining line when removing the OEM muffler so the owner can go back to stock if/when desired.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
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Old 04-12-2013, 04:01 AM
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Thank you for the replies. I was unaware that I had a special wishes car and the tube actually adds HP. I am on my way back out to the garge now to put the stock muffler back so I do not lose newtons. By the way where is that swamp land and can I build on it?
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Old 04-12-2013, 04:29 PM
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He was being facetious. The tube was not added to special wished cars, they all had them, and it doesn't add power. The air injection system can reduce boost lag a bit but with the 3LDZ a bit is nothing.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 04-12-2013, 08:28 PM
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Here is a picture of the capped line that used to connect to the catalytic converter, and the cat/muffler.





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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 04-12-2013, 08:41 PM
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