G'Day Wallsy and welcome to the Australian Chapter m8.
Nothing wrong with the banks system but the price. There are plenty out there that do the same for alot less. Depends on what ya wanna spend, but you are on the right track. To get the best out these things the first step is air in and air out. Your intake and exhaust. I have the aFe stage II intake and MRBP 4" exhaust. The aFe is a wash and oil conical filter that flows all the air that you will need at any HP. It also separates the filter from the hot engine bay.


pricey but good
Riffraff Diesel: AFE Stage 2 Intake

and here is the exhaust. Now I went with the stainless steel but If I was to do it again I would get this one with the Stainless steel tip

Riffraff Diesel: MBRP 4" Turbo Back Aluminized