We did some testing on intakes and the Uni filter showed notable improvements across the board. We haven't done much testing on the exhaust side but we did have a fairly modded buggy last year and put an FMF universal slip-on on and loved the sound.
Take a look at this vid below. It is our stock buggy verses our modded buggy with Uni, FMF, 13g sliders, and A-9 cam.