banks system on a ford e450 m/home 30'

I've got the banks power pack system on mine. previous owner put it on, so I don't have numbers before it was installed. system has k&n canister air filter. mass air flow sensor was moved, new exhaust system. I took it down to california last christmas and drove it through the mountains just north of LA and up the coast. Whole thing handled great. Plenty of power for that old an engine. Exhaust sounds cool too, better than my v10 van. is it worth it? hard to say. gas millage was around 8-9, but was driving through twisty winding back roads as well as flat highways. this is my first MH, previously towed a TT. I had fun driving it (wife got car sick) I could probably driven faster through the mountains, but didn't feel safe pushing too much.