Whatever you do don't go for Gforce Sport Comp-2's
I've got them on my MX5 and it is borderline unbearable at highway speed. Last long drive I took (~ 6 hours) I had to wear earplugs.
An alternative would be to soundproof the trunk area - I'm not too familiar with the 86 (yet
) , but some dampening material + closed cell foam might help.
For reference, blizzak ws80's made significantly less noise than the comp-2's