I run a OS twin in my 31 with 25neo , holds up well to 3rd gear limiter launches and 26dett 31 runs Nismo coppermax with no issues , no rattle from the Nismo unlike the OS .
I have 25det NEO in my 31 .. you can find stagea versions cheap as they need sump mods to remove diff section and most folks shy away as its not bolt in ..
GO THE NEO