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Old School
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4,233 Posts
It's an emmission control item. It traps fuel vapors from the intake and recirculates them back to the tank.
 

·
Old School
Joined
·
4,233 Posts
Nothing except you run the risk of failing the visual smog inspection.

You gain some room to install stuff under the hood, but it won't give one single bit of increased performance.
 
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