Headers

[Paul]

On the B&B system, headers with no CATs, but with B&B pipes with CATs near the B&B muffler, the stock 1998 wiring worked.

However when I installed the stock Cayman S complete system I had to add around 18" of wiring to each side to make the secondary sensors' wiring reach the stock header CATs rear bungs. Been that way for about 2 years with no issues.

[Frodo]

A followup question:

While I like these headers just fine, I've have noticed something mildly bothersome that didn't exist prior to their installation. At right about 2100 RPM I get this humming vibration that you can actually feel as well as hear. It goes away above and below that RPM. It feels like it's vibrating through the frame of the car---if I have my leg leaning against the console to the right of the accelerator petal, it actually vibrates my shin bone!

Unfortunately, I can't reproduce the vibration while sitting in neutral and bringing the RPMs up to 2100. It only occurs while the engine is under load, ie car in motion. I've checked/tightened the header bolts (they were fine) and am not sure what else the explanation could be.

Has anyone else experienced this?

[BYprodriver]

If you have never replaced the front engine mount replace with the 987 mount. If you have replaced the mount repost & we will try again. Please tell us how your O2 connections went, any CEL?, P codes, header brand? Sorry to ask for more info than I gave but you write so well & didn't want to miss this chance.

[Frodo]

Originally Posted by BYprodriver

If you have never replaced the front engine mount replace with the 987 mount. If you have replaced the mount repost & we will try again. Please tell us how your O2 connections went, any CEL?, P codes, header brand? Sorry to ask for more info than I gave but you write so well & didn't want to miss this chance.

On the sensors I basically cheated, just used the O2 sensor defoulers. At first I used some short straight ones---wasn't enough, still got the CEL. The codes were:

P0133, P1275: Aging of Oxygen Sensor Ahead of Catalytic Converter (Cylinders 1 - 3) - Below lower limit

P0153, P1276: Aging of Oxygen Sensor Ahead of Catalytic Converter (Cylinders 4 - 6) - Below Lower Limit

Not sure why the codes are regarding the O2 sensors ahead of the cats. I would think that by eliminating the first set of cats, codes would be for the sensors after the cats. (I'm also unsure why there would be, for each cylinder bank, TWO codes that indicate the same condition, ie P0133=P1275, and P0153=P1276.) Anyway, I ordered this:

...and the extra length + the angle seem to have done the trick. It's been at least 100 miles and no CEL so far.

BTW, I did the front motor mount (a Pedro-refurbished one) about 3k miles ago.

The headers were some Turbowerx knockoffs from ebay. As I said earlier, they do seem to be well made, in spite of their affordability.

[Homeboy981]

Originally Posted by Frodo

On the sensors I basically cheated, just used the O2 sensor defoulers. At first I used some short straight ones---wasn't enough, still got the CEL. The codes were:

P0133, P1275: Aging of Oxygen Sensor Ahead of Catalytic Converter (Cylinders 1 - 3) - Below lower limit

P0153, P1276: Aging of Oxygen Sensor Ahead of Catalytic Converter (Cylinders 4 - 6) - Below Lower Limit

Not sure why the codes are regarding the O2 sensors ahead of the cats. I would think that by eliminating the first set of cats, codes would be for the sensors after the cats. (I'm also unsure why there would be, for each cylinder bank, TWO codes that indicate the same condition, ie P0133=P1275, and P0153=P1276.) Anyway, I ordered this:

...and the extra length + the angle seem to have done the trick. It's been at least 100 miles and no CEL so far.

BTW, I did the front motor mount (a Pedro-refurbished one) about 3k miles ago.

The headers were some Turbowerx knockoffs from ebay. As I said earlier, they do seem to be well made, in spite of their affordability.

Hey @Frodo,

Sorry to reincarnate an old thread….but how is your HEADER SOLUTION working? Are you still throwing CEL codes? Did you flash the ECU or solve it mechanically? Where id you get the "L-shaped" sensor extenders and do you have a part#?

Inquiring minds want to know…especially since my headers are due in tomorrow!

Thanks!