Schnell Headers on 986 with Stock Exhaust

[rule1]

Again go to maxspeeds full exhaust ad for the dyno results. I have put about 2000 miles since the install and no CEL. I have muffler,headers,and EVO intake and pulled 209 HP to the rear wheels on Imagine Auto's dyno.

[blinkwatt]

Are you Jarret R of MO that's in the pic?

[rule1]

Yes, thats my white boxster.

[Cloudsurfer]

4 bungs in a non catted header do nothing for you. The engine ECU cares about the first set, as it uses that to control the fuel mixture going into the engine. The second set are there for OBD II diagnostics to detect catalytic failure (or in this case, cat removal). This is why you should get a CEL if you simply plug all 4 into the non catted header. You can possibly get by with a spark plug defouler, which moves the tip of the O2 sensor out of the exhaust flow somewhat and on some cars will cause the secondary O2s to read "normal" as if they are seeing catalyzed exhaust.

Relocating the secondary set to after the secondary cats may work, but you are going to change the impedance of the circuit with the added wiring. In my case, I also do not have secondary cats as I have the FabSpeed system.

I am VERY surprised you have not gotten a CEL on your car yet.

Patrick

i have a 99, will i ever receive A CEL, from adding after market headers??

[blinkwatt]

Originally Posted by blkboxster

i have a 99, will i ever receive A CEL, from adding after market headers??

Dude don't buy them yet,they just released the headers a couple of months ago and who knows what kind of issues you could have with them.

I don't like how they gave a 'one size fits all' idea for the headers,that's half assing it. Most vendors sell a non e-gas and e-gas set of headers separately.

ok, thanks for the info, tell me whenever you find a good company that makes it for the 2.5's

thanks

[panameras]

Originally Posted by blinkwatt

Dude don't buy them yet,they just released the headers a couple of months ago and who knows what kind of issues you could have with them.

I don't like how they gave a 'one size fits all' idea for the headers,that's half assing it. Most vendors sell a non e-gas and e-gas set of headers separately.

I was hoping to get a little more midrange and slight top end increase from these headers. These definitely gains to be made by looking at the tiny unequal length factory pipes.

[Adam]

Originally Posted by bmwm750

4 bungs in a non catted header do nothing for you. The engine ECU cares about the first set, as it uses that to control the fuel mixture going into the engine. The second set are there for OBD II diagnostics to detect catalytic failure (or in this case, cat removal). This is why you should get a CEL if you simply plug all 4 into the non catted header. You can possibly get by with a spark plug defouler, which moves the tip of the O2 sensor out of the exhaust flow somewhat and on some cars will cause the secondary O2s to read "normal" as if they are seeing catalyzed exhaust.

Relocating the secondary set to after the secondary cats may work, but you are going to change the impedance of the circuit with the added wiring. In my case, I also do not have secondary cats as I have the FabSpeed system.

I am VERY surprised you have not gotten a CEL on your car yet.

Patrick

^ He is right on the $$$. The only header going on my car is the faspeed with the integrated cats. Hey, they are expensive, but I don't want to have to clear a code every other day either.