I don't have any experience with that software, but it looks like it's only good for about 10 hp. I think the 4.8 is pretty quick as is, but I doubt that software will make any noticeable improvement...maybe 0.05 seconds in the 0-60 and 1/4 mile (say from 5.9 to 5.85 for 0-60 and from 14.7 to 14.65 for the 1/4). If you want a real improvement, you'll have to trade up to the 50i or M.

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2017 Nissan GTR Red/black - Tune/midpipe
2013 BMW X5 50i M-sport Alpine white/black - Dinan stage 1
2016 Jaguar F-Type R Gray/red