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Old 09-28-2019, 10:38 AM   #1
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Intake manifold fitment question

Will an intake manifold from a 3.2/3.4/3.6 bolt up to a 2.7? Tried googling it, and didn't really come up with conclusive results. I feel like it has the potential to be a decent and relatively inexpensive upgrade, if it could work.

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Old 09-29-2019, 04:46 AM   #2
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2.7 and 3.2 intake are the same. 3.4 should work but is asspain to fit. Id spend money and energy on a 987 airbox instead
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Old 09-29-2019, 02:35 PM   #3
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I already have a custom cold air intake, so that's why i'm looking at the rest of the intake system.
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Old 09-29-2019, 04:28 PM   #4
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Not sure about the 3.4 but the 3.6 is on risers that will cause fitment problems.
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Old 09-29-2019, 10:47 PM   #5
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What kind of fitment issues? If it's the cover on top or the edges around it, I will happily massage the area until it fits, if it's for an actual performance gain.
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Old 09-30-2019, 03:32 AM   #6
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I believe the 3.2 and 2.7 use the same intake just like they use the same exhaust system. The 3.4 and 3.6 have different mounting holes for the intake. Youll have to drill and tap new mounting holes into your 2.7 head. The heads are cast with both.
I go over installing a 3.4 intake onto a 3.2 here. Woody's build thread
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Old 09-30-2019, 04:37 AM   #7
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I also have a detailed DIY for the 3.4 intake (which is the same as the 3.6 btw).

not a lot of fun
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Old 10-02-2019, 06:07 AM   #8
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I've seen elsewhere the 3.4 intake manifolds for under the Cayman cover.
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Old 10-02-2019, 08:29 AM   #9
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I believe the whole engine has to be lowered even with the Cayman cover. I can see how that can be done at the rear but not so much at the front
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Old 10-02-2019, 09:56 AM   #10
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i think it was gonolaus (sp?) that was able to fit the 3.4 intake under the 987 cover. if you do want to lower, it is just spacers between the engine mount and the chassis. note that the spacers will require longer studs (or bolts). you have about 1/2" play before the transmission mounts need to drop as well. in this case you need to switch to 993 engine mounts as there is insufficient thread on the oem units for any lowering.
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Old 10-02-2019, 10:35 AM   #11
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In the car I've seen it was a case of whole rebuilt 996 3.4 in to a 2.5 Boxster with the Cayman cover.
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Old 10-02-2019, 04:51 PM   #12
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Well, like I said, I'm not worried about fitment, I'll just chop the cover as needed. I'm more concerned about it bolting to the engine, and if so, what potential benefits I could expect.
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Old 10-02-2019, 05:15 PM   #13
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Its not the cover but rather the front of the engine compartment lip that interferes.

Bottom line, waste of time and energy on a 2.7
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Old 10-02-2019, 07:48 PM   #14
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Yeah might be worth it on a 3.2; cannot say I would certainly like to try it if I had the time. What were the results and findings for 3.2s? I would think this move would be needed for engines that are now 3.6 (up from a lower displacement) and need the proper intake runners.
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Old 10-03-2019, 02:30 AM   #15
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Quote:
Originally Posted by WizardSmokey View Post
Well, like I said, I'm not worried about fitment, I'll just chop the cover as needed. I'm more concerned about it bolting to the engine, and if so, what potential benefits I could expect.
You'll get more bang for the buck opening up the exhaust.
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Old 10-03-2019, 04:32 AM   #16
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Yeah might be worth it on a 3.2; cannot say I would certainly like to try it if I had the time. What were the results and findings for 3.2s? I would think this move would be needed for engines that are now 3.6 (up from a lower displacement) and need the proper intake runners.
I put them on my 3.2. Power difference was not earth shattering, but my butt dyno is meh anyway.

At this point, my car has pretty much every bolt on you can do (987 airbox, custom intake tube, 996 TB, 996 plenums, ud pulley, headers, full exhaust, tune) so if anything, I should experience the biggest gain.

I agree with woody that on a mostly stock 3.2, I'd look to other mods first.
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Old 10-04-2019, 04:26 PM   #17
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Quote:
You'll get more bang for the buck opening up the exhaust.
Exhaust is as open as it can get already, lol.

Basically, I'm trying to find all the bolt-ons that I can do to a 2.7 that once it goes, i can then transfer over to the 3.2/3.4/3.6 that will replace it.
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Old 10-09-2019, 04:22 AM   #18
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I get it. My rallycross boxster uses a 2.7. I used modified exhaust manifolds from a 997 and a 3.2 ROW tune. Losing 1000lbs was the biggest advantage. I was able to smoke a tire for over 100 feet with that combo. https://www.youtube.com/watch?v=ZRFV_rATtF8

I've since switched to a lightweight flywheel and electric water pump after that video.
That was a large improvement too. Getting the rpm's up out of a corner is instant now. I'll probably switch to a 996 intake if I ever yank the motor

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