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Originally Posted by ChrisK

Which catch can is everyone purchasing?

I see two different brands available:

Turner CC ($299): https://www.turnermotorsport.com/p-5...tem-f8x-m3-m4/

BMS CC ($199): https://x-ph.com/burger-tuning-oil-c...b58-s55-s63tu/

Don't know about the Tuner one, but the BMS baffle is not that great. It's just a series of holes, but doubt the Turner one is any better. What you can do to make it filter better is put stainless steel scouring pads inside the can. As the oil and gas vents into the can the oil will cling to the extra surface area of the pad which will help separate out more oil before being vented back. There are higher end catch cans that have micron bronze filters etc., but they cost a lot more and doubt you'll find one specifically made for the S55. Just make sure the pad you're getting doesn't have any loose bits before installing, you don't want that finding it's way back to the intake. You find some people actually use steel wool as a filter. Do not go that route, the steel wool is way too fine and comes apart easily.