Camry headers? Options

[mi645]

I recently found out that some camrys came with a 4-1 header oem that deletes our first cat? Is this a bolt on to our a car? 99 Celica California spec I'm trying to get rid of the pre cat would it would bolt on 100%?

[Special_Edy]

^lol those are both from me,


I came up with an excellent analogy the other day.
Imagine you want more water to come out of the garden hose but the spigot is only halfway open. Would putting a larger diameter garden hose increase the amount of water flowing out? Not significantly, but opening the spigot would. BTW your engine(specifically the head) is the spigot and the hose is your exhaust.

To answer the OPs question, I do know that the Camry 5sfe has a balancing shaft inside the block and the Celica/MR2 5sfe lacks this balancing shaft. I read that when swapping a Camry 5sfe into a Celica the celica exhaust wont fit because of the additional bulge of this balancing shaft. This leads me to the conclusion that the downpipe/midpipe(w/e it is) is probably slightly different, though Im not sure this makes the header/manifold different.
I do know that the cylinder heads are identical, so the header will bolt to the cylinder head properly.

Also, I have a 94 Celica GT with federal emissions and it came with only 1 catalytic converter. This cat is located inside the manifold, which is the one I assume you want to delete. I would caution you to verify that it isnt necessary before you remove it. One thing to look at is the location of the O2 sensors. You should have 2 O2 sensors, the first one is before the catalytic converter and is used to control fuel trim for the ECU. The second O2 sensor is for emissions only and is located either between the two cats(if indeed you do have two) or after all of the cats. If it is after ALL of the cats than you may be able to delete one and not throw an emissions failing code. If the second O2 sensor is BETWEEN the two cats, then you will absolutely fail emissions if you remove the first cat. It is possible you are looking at a resonator not a catalytic converter, they do appear similar and only differ outwardly in location.