Cat bypass
 

I’m looking to delete the cat on my 87 turbo. Yrs ago I owned a 86 and replaced it with what they called then a “ test pipe”. That pipe had a fitting for the oxygen sensor and a connection for the air pump. Now I see some without those fittings.
Are they still available or do I eliminate them?
Without the ox sensor and also eliminating the cat will idle and off idle be lean?

lots of companys still make. Fabspeed etc

I have one stashed away, without the fittings. Its the poor man's way of deleting the cat for less exhaust restriction, something people do where you want the benefits but have to return to stock to pass emissions testing. It came with my first 930 and was quickly shelved as I installed an after market muffler (no testing required here).
As for running without the O2 sensor, I always just unplug mine and tune the idle mixture without the Lambda system...in other words, in open loop. I don't like the Lambda forcing a lean mixture just to keep the cat nice and hot.

I’m looking for a cat bypass if anyone out there has one.

Would anyone interested in selling their Cat Delete pipe? If so give me a call. 215-589-0988.