I would be very surprised if you could tell the difference between 8kg and 12kg wheels in a blind A B test.
What you will be able to notice is going to wider wheels (+wider tyres). If you don't have to abide by any rules, I'd fit the widest wheels you can get under the guards.
I mean the stuff on the side. It really depends on what the JSAI bar has - I'll make the assumption it has the strakes and that the end is just a flat piece.
Otherwise....
Are you talking about the hole at the back end that is just a hole (albeit one with some shape to it, as you perhaps say), or are you talking about the big strakes that run down the sides of the recess?
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