Separate exhaust pipes from each head.

Does anyone know of the possible emission repercussions of completely removing the crossover pipe, and having a separate exhaust pipe for each cylinder head.

Assuming I installed a catalytic converter on the extra pipe, would the truck be able to pass an emissions? I live in Washington.

Also, it's 1995 3.4l Tacoma

My biggest concern is the absence of the driver side cylinder exhaust not going through the original pipe, would mean it would not pass through the O2 sensors. I feel like the amount of exhaust wouldn't matter to the computer, only quality of the gas...

Having a separate exhaust pipe from each head would be F'ing awesome!

 

You need a crossover regardless to equalize back pressure to either cylinder bank, otherwise you'll lose power.

I've heard the best cross over to use is the "H" rather than an "X". I have absolutely NO experience with this myself though.

4 banger 4 lyfe

Just "Y" it after the O2.

I personally don't really like the sound of V6's with dual exhaust, 3 cylinders isn't nearly as harmonic as 4, like in a V8! But that's just MY opinion, and it's nothing you couldn't un-do after you did it! just some extra work.

Edit: I lied, 300zx's sound pretty retarded. Post a video, I'm interested.

 

Anything is possible if you have the skills. I ran mine briefly with every thing removed to the first cat exhaust flange. Not very loud considering. It would be too much money and time to set it up right. If anything gut both cats and run a O2 simulator if you want noise.

 

Repercussions would depend greatly on engine performance. With no O2 sensor to monitor the left bank, any problems that occur on the left bank will not be detected, as far as exhaust. For example if an injector was dumping too much fuel, the computer would not know it. Also, any emissions issues on the right bank would be trickled down into the left bank. For example if you were running rich on the right bank, but not on the left (for whatever reason) the computer would STILL alter the output on the left bank, because that is all it knows: single exhaust system.

So while it CAN be done (though routing the other pipe would be difficult if you have 4wd) it really SHOULDN'T be done for good engine operation.