i have a N/A Catless from the header back you just have to go on needswings and buy the o2 J-Bung. they will make the o2 sensors think there are cats on the car and you will not get a light it works by puting the o2 out of the direct exhaust stream so the o2 doesn't pick up all the fumes and reads clean on the ecu. i had mine for a while and no engine light. AND the talk about the car will not know if its running lean or rich the secondary o2s after the cats are only for cat efficiency the two o2s before the cats read air fuel so that wouldn't be an issue

heres what you need
O2JBung.aspxStainless o2 J-Bung

 

okay i dont know much about the 02 sensors and probes but i have already deleted my resonators and also want to take out the rear cats. what would i neeed to do to keep it from throwing a code

 

What kind of differences have you observed on the N/A with all those restrictions removed? Better overall performance, loss of torque, etc...

Thanks!

 

nothing there are no sensors behind the front cats so remove the rears with out any problems. jim

 

sweet! thanks

 

Right now im running straight from the front two cats. I can't tell any loss low end, and it feels a little better top horse power i would say.

I'm curious what it's like completely straight piped though as well. Its already pretty loud and throaty with just my front cats. I was thinking maybe if i remove my front cats and it's a little too much, I'll throw a glasspack or two on or something.

 

I'm gonna try and post a video of my car as it runs now...

Here we go

http://www.youtube.com/watch?v=sqnkiRtn5Tg