On modacar.com, it says that you can buy a Factory Type R header for 45 bucks (unless im reading it wrong). Is a type r header a good one? anyone put one on a gsr?
http://www.modacar.com/products/Acura/Integra/MODAHEA/

also, what are the advantages of a 4-2-1 header vs. a 4-1 or other set ups?