I'm lookin to throw a K&N in my 91 vert and was wondering what size cone filter I could fit without modifying anything? What do all you NA owners use? Thanks.
By the way, I did a search and came up empty as to the largest size I could use, all the posts had people saying how small their filter was, which doesn't really help...

 

Check E-bay... You can get the Conversion Bracket and filter for cheap.. i think 3 inch is typical.