Ok finaly done it, after a few more quotes roo exhaust fitted $1900 no chip, taipan the same, Tweed Heads exhaust for redback exhaust & tunit chip $2280 fitted, so I ended going with the redback system & a tunit chip $2050 fitted this was done by Lindsay from Caboolture exhausts, it was only fitted today so I will give some more feed back after I get a few more k's with it on, but what can tell at the moment is that I have just driven 17500 km around Australia without it on and my fuel economy was anywhere between 16.8 - 24 lt/100 but mostly sat around 17.5 lt/100 towing 2ton 18ft off road pop top, after leaving Caboolture today to Marybrough I got 14.5 - 14.8 lt/100 still towing, fuel up there and from there to Apple Tree Crk where I have pulled up for the night I got 16 lt/100 this is all by the trip computer, so there a definite saving as well it pull through the hills better, will post more later.
Update;
Took the van off and took the car a run I had to reduce to level 3 because when I held it flat to the floor anything higher then 3 car would stall for a second through gear changes, Lindsay is looking into it for me.