Lolo-J,
Everything is relative - depending on driving style, track surface, what you are trying to do with the car. We haven't used the brass brace and bulkhead together often, but it helped us to faster times in a few high grip circumstances. It's your lap times that count. Brass or weights) is a tuning aid to use, to improve lap times, not fit and forget.
This thread was in reference to astro. For your carpet track you're right - add weight and see what it does for you. Regarding aluminium bulkhead etc I only fit them for strength - there's not much difference in weight.
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