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What are these two tubes on either side of the air cleaner that are blanked off with light blue caps? On an '87 S4 auto. Thick-walled tubing, like for hydraulics. Just curious.
The base of these tubes where they bolt to the exhaust pipes can rust thru causing a small exhaust leak. The top of the tube that you show can look fine. People variously replace the tube with a ball bearing, bolt or some such under the retaining nut to plug the hole under the retaining nut.
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What are the blanked-off tubes?
