If your just trying to polish up surfaces that are already smooth then just use an type of Alum. polish. Mothers, McGuires, etc. will work fine.
If you are trying to do more, like removing casting marks, port the inside of the MAF, then you are going to need to use abrassives, and the Dremel is going to make it tuff, mostly because they don't make quality Mandrels and sanding rolls, although Jewery polishing kits might have some. To do serious porting/polishing you really need a good diegrinder.
if needed, try here:
http://www.progresstool.com/cat_polishing.cfm
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93Z M6 Black: The 385 Lives! Supercharged, 3-core front mount intercooler, GTP heads, 3:73's, Street twin clutch, Jethot Longtubes, Mufflex 4" catback/spintech, S+W cage, Spohn Suspenion, Yada Yada Yada
1) Build it
2) Race it
3) Break it
4) Repeat!!!
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