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These tubes are part of the AIS system. They inject air into the exhaust system to help clean up emissions. If your bike is a pre 2006 and or pre 2005 Cali bike, you can remove the system with no ill effects. The later yrs had a catalytic converter and removal can cause an over heat condition. Here is a link to an article describing the removal process. I have a 2005 and mine is fully removed and plugged at the heads. If your tubes have already rusted through removal and not plugging is your option short of replacing the defective parts.

http://www.sloneservices.com/SilverBack/VStar1100-FAQ-05.htm#AIS
 

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These tubes are part of the AIS (Air Induction System). On bikes pre 2006 and pre 2005 California, the system can be removed or non-functioning with no ill effects. On the later yrs removal or non-functioning can cause an overheat condition of the Catalytic Converter present in these exhausts. As your tubes are already perforated removal is your only option short of replacement, depending on yr. Mine is a 2005 non-California and I have mine completely removed (all components). Here is a link to the removal instructions. Removal also helps with popping related to the installation of aftermarket performance exhausts.

http://www.sloneservices.com/SilverBack/VStar1100-FAQ-05.htm#AIS
 

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When they talk about plugging the lines its usually done at the pump end not the cylinder head. If you do a google search for AIS Plugs you'll find some vendors that make the plugs and sell the kits, also try E-bay. You remove the elbows with vice-grips and a slide-hammer. I've also heard of using spent .45 casings on the tube portion of the elbow. Have no personal knowledge of that though. I removed the vacuum line from the rear intake manifold and rubber capped(Autozone), removed the pump (rear leftside engine cover) the chrome lines to the cylinders, the Elbows and plugged them.
 
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