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Sharing my thoughts
I had this concern when I inspected my box, and I was 90% certain it was not air tight, that said, my car has been custom map and I don’t notice any issues, but my map for sure addresses any extra air via fuel trims, and all within the ecu failsafe as I don’t have any check engine light, even before mapping. I also noticed zero change in performance from my CSL Karb, so I am sure I am not missing anything other than the wonderful sound, but I also no longer have the lumpinesses I had with the CSL setup.
that said I kept my CSL and OE air box if I ever want to go back to either
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