The weight you save from a lighter wheels and exhaust will not make your car goes 2s faster from 0-60mph nor reach that fat-donald drive-through faster than that pick-up truck.
however, from my experience, it will slightly improve the handling.
when I changed from Vossen to Works, I do feel the Z response to turn-in and cornering a bit better, same thing when I did the cat-back.
So the answer to your question is 1) Yes, it will improve the handling slightly AND 2) No, don't expect it can make a night&day difference
CAD$0.02
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