What is this?

[Lancruza]

My 94 has this box. My 97 does not. What is it?

 

[lp2k]

that is the pair valve system. it is not essential

 

[gummycarbs]

It's what causes the clattering noise for the first few minutes that the engine runs when cold.

It's also active on deceleration when the engine is warm. I only found this out when the tubing cracked, so I got to hear it at full volume.

The black box between it and the air cleaner is a silencer.

 

[sogafarm]

Are there any downfalls to removing the PAIR system parts beyond emissions testing? Does it affect the engine's longevity or dependability having it in place vs. taking it out?

 

[gummycarbs]

Nope. It's there to inject filtered air into the exhaust. It gets the catalytic converter up to temperature quicker and gives a cleaner burn.

Some people have removed the PAIR system and moved the oxygen sensors to the PAIR holes. Makes them easier to access and protects them from damage.

I'm not removing mine because I don't see a point. I've got dual batteries and the PAIR is still there, just not the silencer box. The only reason that I'd remove it is if I wanted to put a York compressor on and needed the room.

 

[retrofive]

Nope. It's there to inject filtered air into the exhaust. It gets the catalytic converter up to temperature quicker and gives a cleaner burn.

Some people have removed the PAIR system and moved the oxygen sensors to the PAIR holes. Makes them easier to access and protects them from damage.

I'm not removing mine because I don't see a point. I've got dual batteries and the PAIR is still there, just not the silencer box. The only reason that I'd remove it is if I wanted to put a York compressor on and needed the room.

^^^

And just get the 95+ tube (sorry for lack of terminology) that run the length of the engine. I just used a expandable pipe plug for the air box.

That probably didn't come out right, but just search for PAIR removal and you will see. Simple.