how many catalytic converters?

[eecc]

are there 3 cats in the gen4 camry?

[5Sfte]

In the 4CYL there are 2:
1. A three-wasy cat attatched to the exhaust manifold
2. A second one further down the exhaust piping underneath the car, about underneath the armrest.

I'm not sure about the 6CYL, but it is probably the same.

[EKam]

For v6, 2 pre-cats on each manifolds and 1 before catback.

Not sure if it applies to all year gen4s.

[5Sfte]

Duh! What was I thinking, of course there are two pre cats with two manifolds!

[eecc]

so im assuming, if i replace the headers with aftermarket ones like from JP Performance, it would take out the precats?

if so, would i still be able to pass emission tests?

one more question, the Y-pipe has nothing to do w/ the cats rite...so replacing it would be perfectly street legal?

[EKam]

You don't have to worry about emission as long as there's a cat on the car. (Unless if you're living in Cali...)

Y-pipe has nothing to do with emissions, but on the gen3, the cat is attached to the y-pipe.

[wontonjohnny]

huh??? they have cat's in the manifolds????

[5Sfte]

No, ATTATCHED TO THE MANIFOLD.

[wontonjohnny]

hows that???? like in between the header and manifold???

[5Sfte]

Originally posted by wontonjohnny
hows that???? like in between the header and manifold???

You're screwing with me right. Just in case you aren't, let me explain myself. On a stock 4CYL Camry there is a 3 way catalytic conveter connected directly to you exhaust manifold. (Combustion chamber->Manifold->3-Way Cat-> Expansion Piping -> Catalytic Converter -> Exhaust Piping -> Muffler

When you add a aftermarket header, it replaces the stock manifold and should eliminate the 3-Way Cat.

[eecc]

You don't have to worry about emission as long as there's a cat on the car. (Unless if you're living in Cali...)

so ur telling me that as long as u hav a main cat in, everything is ok.

the precats dont affect emissions? what do they do?

[djprefix]

Originally posted by eecc


so ur telling me that as long as u hav a main cat in, everything is ok.

the precats dont affect emissions? what do they do?

There's no such thing as a precat, there's a cat on the manifold and then one after the downpipe. In most states as long as you keep the one after the downpipe you should be fine. If you're in california though it's an automatic fail of smog.

[eecc]

sorry, noob question

downpipe = y-pipe?

[EKam]

Originally posted by eecc
the precats dont affect emissions? what do they do?

For LEV rating.

[Razo-E]

Originally posted by EKam
You don't have to worry about emission as long as there's a cat on the car. (Unless if you're living in Cali...)

Y-pipe has nothing to do with emissions, but on the gen3, the cat is attached to the y-pipe.

DAMNIT..!!