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      11-22-2013, 08:54 AM   #579
COBB Tuning
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Drives: 335i
Join Date: Dec 2010
Location: Austin, TX

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Quote:
Originally Posted by big_gtr View Post
hi josh, when i use stage 2+,can i use knn replacement filter for intake (stock airbox filter) or i must change into stage 2 aftermarket intake kit?
You should be ok with a drop-in filter, but an aftermarket intake will help the engine breathe in the top end. You can always log to make sure everything is happy.

-Josh
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