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      12-21-2018, 02:06 PM   #2
BMWDriverX
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United_States
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Drives: F90 M5
Join Date: Jul 2017
Location: SoCal

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Not worth it when people dyno up to 800whp on the stock air boxes. If you don't want to run a front mounted CAI like RK carbon then remove the carbon filters, get a pair of BMC filters for the stock air boxes and close up the holes on the bottom of the air boxes. You'll be sucking in air only from outside and it won't change the noise level much. Between that option and the AFE there is no performance difference that you are going to hear or feel.
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