Looking for the torque spec on the bolts from the exhaust manifold to the cat and the cat to the exhaust, and the o2 sensor. Thanks for the help!

 

25 lbs/ft for the bolts, 33lbs/ft for the O2 sensor according to my manual.

 

Thanks Reach, good to know! I'm doing my catback install tomorrow.

 

Personally, I would hand tight the O2 sensor like you would a spark plug and apply anti-sieze.

 

That's what I did (and was told by Acura)
- apply anti-seize (or if its a new OEM sensor it'll have some pre-applied)
- firmly finger-tighten
- use wrench or O2 sensor socket+ratchet to turn 3/8 to 1/2 a turn. *edit: you will likely feel the crush-washer deforming -- this is approx. when you are done tightening it*
- drink a beer, you're done.

 

I also hand tightened the O2 sensor (and yes, the anti-seize should be on the OEM replacement).