The 4-1 headers and 4-1 race headers are the same, don't know why sam put em up on the site like that. There is no difference between the 4-1 "Race Headers" and the 4-1 headers. Both are made by the same manufacturer, its like getting the "racing carbon fiber spoiler" or the "carbon fiber spoiler" its just the name. Don't worry you will get a awesome product.
Off topic, I live in somersworth, nh near portsmouth, NH, there is a bunch of us going down to pennsylvania on the 29th for a hyundaituner.com meet, there is gonna be a huge turnout, you should go down with us if you can. Check my site for more details.
-shaun