civichbb18c

im ordering a high flow cat... will i need any 02 bungs. its a 1993 civic cx.

Luserkid

The O2 Sensor doesnt go into the cat. so i dont think you would. But i have a DX so it might be differnt from a cx. But i still say no.

civichbb18c

what about flanges their two bolt right? and need two of em obviously (btw there is no cat on the car now so i cant reuse anything)

vtekthis

only if the car is obdIIb then it will have 2 o2 sensors. otherwise there should alrady be one welded in.

civichbb18c

so i will have to get one on the new cat then? but is it in front or back? and if the apexi ws is approx. 2.36 whatever inches dia. should i go with a 2.25in cat or 2.5 or doesnt it matter cause i can get flanges to fit?

civichbb18c

what no help from the 30 people who read this, im trying to order it now pweez i know u guys know!

civichbb18c

come on guys i gotta know where i need an o2 bung in the front or back?

rodrez.

Most of the newer hi flow cats come with an O2, sometimes 2 already drilled, and you put a bolt into whichever you don't need. Check out what you have now, if there's an 02 plugged into the cat, you'll need it on the new one. As far as sizing, with that exhaust you can use 2.25.