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THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHOEM 3.8 997S Intake Box in 3.6 996 X51
Leading reported evidence
Replace 996 snorkel
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
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1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
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Performed · outcome unconfirmed
Swapped the 996 snorkel for the 997 and was back on the road in about an hour.
Leading evidence: 'Replace 996 snorkel' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace 996 snorkel' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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1
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Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
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8 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Generation: 20261026T124918Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I came across a local 997 OEM 3.8 Intake Box for a really good deal. I've seen the swap of the 997 and 997S intake in the 996 several times.
I kept hearing the 3.8 box is the best but now I'm not sure. Anyone have any thoughts on this? Pictures attached.
You don't mention what year your car is but on my '99 C2, it fit with no issues at all. If you
do
use the 3.8 snorkel, you need to change
collar that snaps into the engine lid to 'Sealing ring part #
997.110.250.00'.
I did the swap on my 2002 C4S. While I've read a dozen accounts of it just dropping right in without any fitment issues, I had to take a Dremmel to mine and remove some of the plastic "fins" near the center mounting bolt. Good luck.
Don't forget that your X51 intake has an extra pipe that goes to a venturi valve on the back of the intake and plugs into the elbow between the TB and intake box. You'll need a compatible elbow hose.
This.
3.8 airbox dropped right into my 40AE. I could not for the life of me get the mounting screw back in, but the airbox has been totally secure including a track day with just the rubber posts that drop into the chassis. Swapped the 996 snorkel for the 997 and was back on the road in about an hour.
I read the same things. Probably better, at worst it doesn't hurt.
I needed to tweak the airbox near the engine cover latch area, and I needed to relocate the secondary air pump to clear the 997 snorkel. Contrary to other comments I found that the the 997 snorkel got along just fine with the 996 collar. They slip together nicely. (Anyone want to buy a 997 collar, cheap?)
This is a source reference. Confirm exact model applicability in the original material.
