I went the 2 into 1 route last year,I already run twin Akra's 1 and 2 filter holes in the airbox and a PC it runs well really well!! but hey you have keep looking so I bought a second hand system looked good and make's the bike look 100lbs lighter where the shock came was how it transform the engine and power characteristics.

The reality is the only way to find out and try one maybe going from a stock system to a 2 into 1 maybe a plus but after my twin Akra's it was a no from me but!!! if you have an R and will be doing the off roading thing that characteristic might float you boat.