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i took a car for a test drove a few days ago and noticed that this part is missing in the bottom right corner of the photo, just curious to know what it is and if it should still be there, i think all rb25's have em because even r34's have it.. any ideas?

post-30788-1261062229_thumb.jpg

i noticed while driving it when i got up to about 5k rpm it would sort of hesitate or not push as hard as i expected, i know this is normal but on stock boost? seller says coil packs are already ordered and on the way.. car also has pod, cooler and atmo bov

also when i turned of the car, it still running due to turbo timer, it didn't idle steady it kept going up and down could this be due to the externally venting bov?

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The part you have circled is the charcoal cannister, it will have no effect on performance. It's there for emmisions, I'd just check all the point where it has been dissconnected are blocked off. it could have an inlet system leak that would cause rough idling.

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