icsmike

Just curious what you guys do that run no cats. Do I really have to buy a special bypass test pipe? can i have my muffler guy (hes cool *wink* *wink*) just cut them out? thanks.

Richard S

Sure, just cut them out, do whatever you want. The O2 sensor has no idea if there are cats or not. If your guy makes something up, just leave in the O2 sensor bung. In other words, keep the O2 sensor, put whatever you want downstream of it.....new pipe, X-pipe, gutted out cats, high-flow cats, etc.

Rich

icsmike

Thanks. I was wondering because if I remember correctly, if you unplug the sensor from the panel under dash it makes the car run funny.

the flyin' scotsman

I took the opportunity to replace my o2 sensor with a new one when I fitted the Motorsport X sans cats.

I also had removed the air pump previously so when the cats were removed I just cut the plumbing pipe going up to the diverter valve.

Jim bailey - 928 International

Most find that gutted cats have a horrible drone/ resonace right under the console. The exhaust pulses get lost inside the hollow cans A proper X pipe is the solution if you want more than just noise...

Mike Frye

+1 to what JB said, I've got the motorsports crossovers with an O2 sensor and the high flow cats. Works great, got through inspection and runs smoooooth.

OK it did before I screwed up the clutch, but that's another thread.

ceedee

hmmmm mine runs funny , when i connect the o2 sensor. what's up with that?
replacing the o2? or keeping it unplugged? doesn't unplugging make the car run rich?