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Old 05-14-2020, 04:44 AM   #1
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997 T plenum

A question for anyone who has installed the 997 plenum: how did you compensate for the large difference in diameter from the plenum outlet to the manifold? There' a 9mm step there and only a short distance to make it. I've ordered some step-down silicone hose but think it's going to be too long to work.

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Old 05-14-2020, 06:49 AM   #2
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Watch this video on my YouTube channel to see the simple solution at 3:15.
https://www.youtube.com/watch?v=QHAoJDKqxZE
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Old 05-14-2020, 07:24 AM   #3
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Do you worry they'll fail being stretched that far?
I would love to have seen you fit the plenum in there with them attached! I'll bet it was fun.
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Old 05-14-2020, 07:58 AM   #4
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Do you worry they'll fail being stretched that far?
I would love to have seen you fit the plenum in there with them attached! I'll bet it was fun.
Not really a big problem. I ordered a set of silicone reducers but in the end I never used them since the factory ones fit nicely. The original sleeves stretch easily if they're warm. They are quite strong.
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987 air intake TB and plenum, Mantissport 2 litre sump, UDP, Bilstein B6 with H&R lowering spings, re71-rs for track, other stuff.
https://www.youtube.com/user/12shoes2
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Old 05-14-2020, 08:09 AM   #5
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My 2000 was already modified when I bought it, but it has the silicone reducers.
Here's pics from when I was cleaning out the oil from a bad AOS:


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Old 05-14-2020, 11:01 AM   #6
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Currently using the OEM ones as well. They fit. Should be good for a long time!
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Old 05-14-2020, 04:26 PM   #7
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Is this Mod worth doing on a 2.7,.I would keep my air box,.MAF sensor Etc..and just change plenum and TB.?? or do you need to change the air tube and box aswell..??
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Old 05-14-2020, 05:47 PM   #8
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If you search the other threads, I think you'll find the 987 airbox is critical to helping breathing.
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Old 05-18-2020, 07:48 PM   #9
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One more thought while the topic is up: The hose that goes from the AOS to the throttle body did not fit well with the 997 Plenum on my car. I took it off and used a heat-gun to soften it and flex it to a better fit. Is there a better hose to use or did anyone fabricate a good one?
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Old 05-19-2020, 05:47 AM   #10
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One more thought while the topic is up: The hose that goes from the AOS to the throttle body did not fit well with the 997 Plenum on my car. I took it off and used a heat-gun to soften it and flex it to a better fit. Is there a better hose to use or did anyone fabricate a good one?
I did the same as you although if the hose is old, it might crack. I'm sure someone has made their own tube?
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2004 986 S
987 air intake TB and plenum, Mantissport 2 litre sump, UDP, Bilstein B6 with H&R lowering spings, re71-rs for track, other stuff.
https://www.youtube.com/user/12shoes2
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Old 05-19-2020, 06:11 AM   #11
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Quote:
Originally Posted by flmont View Post
Is this Mod worth doing on a 2.7,.I would keep my air box,.MAF sensor Etc..and just change plenum and TB.?? or do you need to change the air tube and box aswell..??
You can change the plenum and throttle body but will need to make up a run from the MAF to throttle body.
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Old 05-19-2020, 10:40 AM   #12
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I did the same as you although if the hose is old, it might crack. I'm sure someone has made their own tube?
I made my own from a clear wire- reinforced hose, with about a foot extra, looped down below the tb, so if it gets accumulation I can see it. Works REALLY, really well.
The non reinforced hose didn't work.... when it was warm it would collapse under vacuum.

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Old 05-19-2020, 12:36 PM   #13
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I made my own from a clear wire- reinforced hose, with about a foot extra, looped down below the tb, so if it gets accumulation I can see it. Works REALLY, really well.
The non reinforced hose didn't work.... when it was warm it would collapse under vacuum.

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Yeah, didn't you make a post about that? Maybe a thread about catch-cans or something? Or was that someone else?

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987 air intake TB and plenum, Mantissport 2 litre sump, UDP, Bilstein B6 with H&R lowering spings, re71-rs for track, other stuff.
https://www.youtube.com/user/12shoes2
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