Ok well a few years ago my buddy bought a big banks kit for his 06 5.9... Well he sold the truck a couple years ago and he still has the banks ottomind6 with tungsten 2 PDA ( brand new never installed)

Will it be ok to put it on my truck? I'm not looking for all kinds of power, but it's pretty much free... I've been trying to find reviews on it and it seems some like it and some hate it... I know smarty is the way to go and the way I wanted too, but this is only like $100. He paid like $1,500 for the kit back in 07-08... But he left the exhaust and intake on the truck and never installed the tuner bc of warranty...

I'm also looking into getting fp gauges... Should I do both? Rail and the other one?