noisy plenum
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I'm not talking from any sort of experience but i read that if u tighten it too much then u hear a plenum whistle and possible oil or gas.. one of the two.. squirts... maybe u either tightened it too much.. or not enough. and i read that after market plenum do have a deeper growl at idle...
#3
when doing plenum mods and leaving the cover off you will hear sounds that were always there - just never heard because of the cover... this is not to say your sound is normal (I don’t know)... but when I first started running without a cover I heard several things that I hadn’t prior (because of the cover) and everything was confirmed to be normal.
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