I'd send it to MexMan!
Seriously -- Aluminum "loads" up sand paper and grinding wheels and carbide tools etc -- so if you're really "bent" on doing this - do a bit of research on the RIGHT kind of paper etc to use. There are special grit types to cut aluminum.
You ask a simple question - but it's not one with a simple answer - because you don't mention if you have any tools - air die grinders or electric die grinders... and you're going to need some "long reach" tools/heads etc because you've got hard to reach places...
If you're like some people we know <------- "we" like to "invest" in tools and equipment that we intend to use forever... If you don't have the tools already - you're going to spend more on them than the manifold would cost... so only you can answer that question. Don't forget that you have to start with roughing grits - work your way down to the finer grits - and THEN you have to polish - so you're going to need various polishing attachments - cones - and balls - and buffs and compounds etc....
Just sayin' ----- you're tackling a big job if you're not already set up for it.
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