Headers and Other Mods - 986 Forum - The Community for Porsche Boxster & Cayman Owners

borboxdiab · 10-18-2006, 05:30 PM

Just made the Evo intake mod an it's great.

Has anyone tried Che's headers on a 00 Boxster S. Just looked under the car and there are most definitely a forward and rear O2 sensor (ie, 2 sensors) on each stock header. Che's header appears to have a port for only the rearmost O2 sensor on each header.

Even if his 00 3.2 S header had two ports for the O2 sensors, would you expect to get a check engine light?

Would a SW upgrade like Revo Technik alevate such a light?

Anyone out there have configuration of EVO air intake, performance headers with O2 ports, cat bypass pipes, a flow thru exhaust, and Revo Technik ecu SW?

Thanx,
Mutt

blinkwatt · 10-18-2006, 05:45 PM

I beleive that Che is having someone form this forum dyno test the headers for 00'+ w/ the o2 sensor in the headers.

borboxdiab · 10-20-2006, 02:52 PM

Drove over to Che's place (Top Speed) in Addison, Texas, today and looked at header for 2000 Boxster S. In fact the header has only one O2 bung (vs 2 which are on my header) -- the one closet to the pipe that has the primary cat on it. Don't think I'll make this mod right now until I sort thru exactly what's going to hapoen to the emisson system (and CEL) since I still have to pass emissions in Texas in the county I live in.

Did buy the free flow SS muffler from Top Speed.

Also had the Revo 5 hr demo installed today at a local dealership for a trial. No dyno, but seat of pants felt like more power in every gear - most noticeable in 1st, 2nd, and 3rd.

jhandy · 11-21-2006, 08:35 PM

yes you will get a CEL. You need a O2 sensor in front of a CAT and one in back of a cat. The CAT does not have to be on the header, but it must have this config. The computer is looking for these type of gasses.
Fabspeed has a set that has the O2 sensors in the right spot, however they are 2+ K$.
His muffler is the bomb however. I have the muffler and fabspeed bypass pipes, no problems and add about 10 HP.
James

MNBoxster · 11-21-2006, 09:42 PM

Hi,

The spacing of the O² Sensor Bungs is critical because the DME attempts to sample the same exhaust pulse both pre and post catalyst for proper Fuel/Spark Map selection.

If the same spacing is not maintained in an Aftermarket Header/Cat combination, the sampling won't be from the identical cylinder and the DME will not be able to make the proper selection and poor performance and/or poor running could result in addition to a CEL.

One of the 1st Aftermarket Headers (I don't remember if it was Fabspeed, B&B or some other brand) had an issue with this until they properly spaced the bungs. Hope this helps...

Happy Motoring!... Jim'99

Adam · 11-21-2006, 09:47 PM

Quote:

Originally Posted by MNBoxster

Hi,

The spacing of the O² Sensor Bungs is critical because the DME attempts to sample the same exhaust pulse both pre and post catalyst for proper Fuel/Spark Map selection.

If the same spacing is not maintained in an Aftermarket Header/Cat combination, the sampling won't be from the identical cylinder and the DME will not be able to make the proper selection and poor performance and/or poor running could result in addition to a CEL.

One of the 1st Aftermarket Headers (I don't remember if it was Fabspeed, B&B or some other brand) had an issue with this until they properly speced the bungs. Hope this helps...

Happy Motoring!... Jim'99

That's right Jim. In fact B&B won't even make headers for any 2000+ boxster because of this. It's a shame that real headers are so hard to find for the 4 cat cars. If anybody has a link to a vendor that has provisions for all 4 O2 sensors that would be great.

RandallNeighbour · 11-22-2006, 05:09 AM

I never thought I'd type the following words: I guess I am lucky to have an older boxster with one set of cats when it comes to exhaust mods.