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Jeff Niceswanger · 04-30-2023, 07:31 PM

The Streetcar Wix filters are 21 micron where the "R" Race filers are 61.Race filters let more particles thru, but flow more and are designed for race application's. I think those Wix Race filters were originally developed for the Busch Series Cup cars back in the 80's and then later released to the general public..

04-30-2023, 07:31 PM	#18
Jeff Niceswanger Senior Member Join Date: Jul 2003 Posts: 869 Likes: 671 Liked 961 Times in 351 Posts	Re: LS engine oil filter options The Streetcar Wix filters are 21 micron where the "R" Race filers are 61.Race filters let more particles thru, but flow more and are designed for race application's. I think those Wix Race filters were originally developed for the Busch Series Cup cars back in the 80's and then later released to the general public.. __________________ Jeff Niceswanger 3740 SS Last edited by Jeff Niceswanger; 04-30-2023 at 09:01 PM.