Jump to content

The RennTech.org community is Member supported!  Please consider an ANNUAL donation to help keep this site operating.
Click here to Donate

Welcome to RennTech.org Community, Guest

There are many great features available to you once you register at RennTech.org
You are free to view posts here, but you must log in to reply to existing posts, or to start your own new topic. Like most online communities, there are costs involved to maintain a site like this - so we encourage our members to donate. All donations go to the costs operating and maintaining this site. We prefer that guests take part in our community and we offer a lot in return to those willing to join our corner of the Porsche world. This site is 99 percent member supported (less than 1 percent comes from advertising) - so please consider an annual donation to keep this site running.

Here are some of the features available - once you register at RennTech.org

  • View Classified Ads
  • DIY Tutorials
  • Porsche TSB Listings (limited)
  • VIN Decoder
  • Special Offers
  • OBD II P-Codes
  • Paint Codes
  • Registry
  • Videos System
  • View Reviews
  • and get rid of this welcome message

It takes just a few minutes to register, and it's FREE

Contributing Members also get these additional benefits:
(you become a Contributing Member by donating money to the operation of this site)

  • No ads - advertisements are removed
  • Access the Contributors Only Forum
  • Contributing Members Only Downloads
  • Send attachments with PMs
  • All image/file storage limits are substantially increased for all Contributing Members
  • Option Codes Lookup
  • VIN Option Lookups (limited)

Recommended Posts

There is a story going around that suggests that the removal of the air baffle and or snorkel from the 987 intake can cause fuel consumption to go from around 20mpg down to 10-12mpg!!!!

Have any of you guys that have removed the baffle plate noticed any problems with fuel use or other problems in general (eg. water getting into the engine?)? :lightbulb:

If you don't know what I'm talking about the thread on how and why you would do this mod is here:


Edited by Wads
Link to post
Share on other sites
    You can remove these ads by becoming a Contributing Member.


I Remove the restrictor plate on my 05 987 as soon that I figure how to remove the vents, but left in place the snorkle. The plate was remove maybe 2 or three weeks after purchasing the car.

I actually was looking for more trottle sound. What I notice after removing the plate was a little more trottle sound not really noticiable if you have top and windows up; but quicker respond in the trottle specially if you have the sport button press.

So far the car has 4500 miles on the clock and not a single issue. The car has being driven in the hot sun and rainy days too.

About gas consumption; Last week I was driving from Little Rock, AR to Menphis, TN for a dealer Apointment and it was averaging from 25-27 mpg driving 75-80 mph. Ambient temperature was in the mid 90's.

Hope this help answering your question.

I am waiting for delivery of a K&N filter who is on back order till mid August, I tell you how sound and trottle improve once I receive and install it. :drive:

Link to post
Share on other sites
  • 1 month later...

With a LHD car you will notice more results in intake noise as the throttle intake is on the left side of the car. I'd expect a better throttle response at lower speeds as has been stated , but there is a risk that at higher speeds 70 mph + losing the restriction may cause the air drawn in to be too high for the fuelling map in the ECU. The electronics would then over fuel to within a specified tolerance (usually 10%) and after that alter the timing to prevent the engine overheating with a weak mixture. This could explain poor fuel consumption on cars with this mod. Unless you have an ECU remap and find that you are running a rich mixture , or need more air , I'd not bother with removing the baffle or change the filter. The K&N filter is a single ply oil filmed paper element which may allow more sound from the engine and will give better air flow. Be careful the oil on the filter doesnt carry over to the MAF , contaminating it and causing fuelling errors. For this reason I'd replace the baffle to prevent pressurising the filter and causing carry over.

Link to post
Share on other sites
  • 3 years later...

I de-snorkeled my 2005 987. I was getting 23.2 miles per gallon before I did the mod. I drove for about 500 miles in mixed driving. Now I get an average of 20.8 after the mod with about 500 miles of mixed driving. I may have lost a little just because I was driving harder to hear the air intake. I can hear a little differance and will probably keep the mod on there. It was not as dramatic a change as it was on my 986.

Link to post
Share on other sites
  • 1 month later...

The 986 has a different air intake system to the 987. It was one of the main improvements on the 987 to increase the air flow into the engine and provide a larger filter media area , thus allowing longer service intervals. Since the 987 3.2 and 3.4 engines both share the same intake and filter system , Id suggest that the air flow as built doesn't restrict power on the 3.2 or 2.7 engined cars. Performance improvements can however be achieved by using the 996 throttle body and remapped software from softronic, this doesn't require a hi flow filter or de snorkel to achieve gains though can be further complemented by fitting a free flow exhaust. It probably works out cheaper and with gains that can be sustained if you simply replace the standard filter more regularly than 20 k miles.

The snorkel also acts as a flow straightener for the air preventing whats known as turbulent flow. Turbulent flow in the air can create problems with the measurement at the MAF , possibly this is contributing to the poor MPG , though more likely its to do with the original engine map being set for a different air flow characteristic.

Edited by berty987
Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.