I just order the Needswings downpipe(catless). The question is, which O2 sensor am i putting in the new downpipe. Correct me if i'm wrong, but there is an upstream and downstream O2 sensor, right? STAGE 2 will be going on before i drive the car in the spring, so i hope that'll take care of CEL codes. Let me know if i have to let one sensor hang or what i have to do. Any help would be appreciated. Thanks

 

The best bet is to use the front O2 sensor in the exhaust system and keep the O2 sensor in the rear connected, but zip tied to the underside of the car some where. The ECU uses the front O2 sensor to adjust the engine cal all the time. But the rear O2 sensor is used to make sure the converter is working OK. Thus leaving the rear out of the exhaust but pluged in 'tricks' the ECU to think everything is fine with the cat. This way you shouldn't have any codes pop up. Unless things have changed in the last year or two, this trick should work fine.

 

THANKYOU

 

The upstream O2 sensor is not in the downpipe. It is in the O2 housing. Take the downstream O2 sensor out of the stock DP and put it in the NW DP.

 

Ahhh, sorry about that. I've never had my down pipe off.

 

OK, THANKS GUYS

 

Man - you had me thinking that my car was some sort of anomaly or something.

 

Just a few years ago it was all just called an exhaust pipe. Maxx fabs website has a nice illustration of what is technically what. To me, it will always just be the exhaust....
BTW, how do you get hold of anybody from Needswings? I googled it one time and came up with a non-functioning webpage and a whole bunch of srt-4 videos. Do they have a functioning website?
Thanks,
Matt