These sound like the AIS tubes. As long as you have aftermarket exhaust they may be removed and plugged. They just slip into the heads. The vacuum hose to the valve under the lower left hand chrome side cover will have to be removed and plugged also.
The AIS supplies air to the exhaust to burn off any left over fuel before it gets to the mufflers which I believe contain catilytic converters.
Hope this helps.
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