Flea Bay had a Needwings Dual Air CAI for the SL55 and It has the filters inline and the setup for ours has the filters behind the grill. .I called Rob at NeedWings and he explained that the inline filters dont flow as well as the 2 Filters design that is MADE for the XF. I started looking for stock SL55 setup because I noticed one of my intake tubes were junk and ended up with much more. I am sure they flow better than the stock filters. and damn they look good. I will update on the install. maybe even take some pics if it works out or not.