I buy from ECS, prefer to buy from an established company that has been in business for some amount of time over Ebay or Amazon where I can't really tell who I am buying from or what I am getting. Filters are simple to make "almost" OEM and I don't care if I spend a few extra dollars for less hassle and confidence in what I buy on what is my most expensive possession after my house.
Probably cheaper places but as long as I have a good experience I can't see a reason to go somewhere else.
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2006 Z4M Coupe - Stromung exhaust, ZHP knob, stubby antenna, clutch delay delete
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