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      02-08-2013, 05:32 PM   #25
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Drives: 2015 M4 DCT
Join Date: Jan 2012
Location: Montreal

Posts: 3,785
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2015 BMW M4  [4.50]
2006 Audi S4  [0.00]
I have been using a K&N on my car. In Canada, it actually was the cheaper option. I paid $75 +tax. The other filters were all $100+ due to shipping and duties.

I used K&N filters on my previous cars and never had a bad experience.

On the M3, it added a nice growl to full throttle induction noises. The car also felt slightly more responsive. My M3 is an '08 that had the restrictive charcoal lined filter.

So I can only recomend it .
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