let me start off by saying, it wouldnt let me post it it misc. or performance so im sorry, but i saw a site one time that had a lot of cheap......like 20 dollars........air filters, i cant remember but i think some were k&n but they had all different sized and they were universal, they had replica hks filters in like red/green/blue.....everything, so if you know this website, or know of one like this i would appreciate it, me and my buddy are making an intake for his 88 535is, and were looking for the biggest filter possible....thanks

 

ebay.