Are you strictly talkin about K&N? Or just cone-style? To me it seems the GReddy is the biggest, but thats what it just seems like to me. I have only seen a few types in real life. Maybe someone else can help u out.

Chris

 

I have an 89 TII, and I put the HKS filter on my car. That thing is huge. I think its like 6-7 inches. I don't know if you want to stay with the cone style, but this might help.