Exhaust sensors when decatting

Can you guys tell me what happens to the exhaust sensors when decatting a '94 j-spec N/A. From what I can gather the second cat has a temp sensor and this can be tied back out of the way.

But does the front cat have the o2 sensor? and do the exhaust guys have to re-fit this to the front de-cat pipe?

Finally when the cats are removed, does the ECU re-learn how to fuel the engine.

Having it done this week so would like to check they are doing the job right.

My first Supra, love it and need to gather as much info of you guys as poss!

thinking of doing the same to mine, been told only to decat 2nd pipe only for better performance, don't know if true , or less fuss when mot is up! interested to find out.

Decatting shouldn't affect the fuelling on teh TT, as the oxygen sensor is before the cats - the temp sensor is just there to warn if, for some reason, the cat overheats. You can tie it up out of the way, or just unplug it and chop it off completely. I've used the route of the temp sensor for my wideband sensor.

:edit: Just realised your on about NA. Ignore my useless advice, I have no clue on the NAs

i noticed when i had both cats removed it had lost a fair bit of torque and was really loud,so i now have the first cat back in

Thanks guys, think I'm gonna leave the first cat in!

I have both the cats removed from my 94 n/a both the sensors are off and everything seems fine.

CWs pipes have a fitting for the sensor in the first pipe, and you just zip tie the second one out of the way as it's only there as a over temp warning for the second cat.

I'd advise going for both, but you will have to replace the 2nd cat for MOT. If you're not sure, then always remove the first cat, as that one is a real mother-lover to deal with.

The O2 sensors are mounted on the 2 manifold sections, the sensor in the cat you can just tie up out of the way.

This pic shows the mounts for the O2 sensors

http://img172.imageshack.us/img172/3594/11outey5.jpg