Can I take three 2 inch overflows and dump them into 4" piping

the amount of water a drain can handle depends on its area

the area of a cross section of 2" pipe is 3.14 sq in, times 3, that is 9.42 sq in

the area of a cross section of 4" pipe is 12.57 sq in

so the 4" pipe can do a lot more flow than three 2" pipes...so to answer your question, absolutely
 
Very cool, thanks guys. Its good to know I can find people smarter than me on here :)

Pics of plumbing tommorrow on my build thread, its turning out kinda cool
 
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