get a "hybrid style" cooler off a reputable ebay dealer/performance workshop, coolers are dirt cheap these days. size it so it will fit nicely infront of your radiator, sprinters have assloads of space for intercoolers.
i'd go for probably a 2.5 inch system on an engine such as yours (as i would want to turbo it)
but a turbo would quieten it down a lot, so your system will need more thought.
i'd use a resonator up front and a lowish restriction muffler up the back, my sprinter is running a press bent 2 inch system with no resonator and a lukey dogleg muffler, its loud but not overly loud, and i think a resonator would help a lot.
where abouts are you located? i had my work done by midas in blackburn, mainly because it was close to where i put my engine in. I was pretty happy with the job and the price.
just remember that most exhaust guys are fairly lazy, so don't be afraid to spend a bit more on a decent system. apparently dandenong exhausts are quite good.
call around and discuss what you want with them, you should be able to pick out the ricer haters from the guys who know their stuff.
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