Have not determined this yet. I will let you know as soon as I have a prototype to begin playing with. I am targeting a 4 inch cone filter, not including flange length.
i want! but other issues got me soo broke.. hope u cant do in future when i got the cash. but love to see people design new pieces tht really boost performance. stock is good but they dont always do as good as can be done due to money constraints... so this is awesome. would also allow u to run different filters