It means your low on window washer fluid. lol. j/k. I want to try this mod soon. I just have an K&N filter right now. Maybe someone else can give you an answer to your question because they might have had the same problem before. Best of luck! :drive:
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The sound of the engine is now very slightly louder,, you can't even tell that much. But the turbo spool and blow off vavle are totally noticable. I've been smiling about it all day now, lol.
As for the first gear vibration,, now that I think about it,,, it's been a while since I did a WOT run in first gear, so this could have started before the mod,,,