what else does her car have on there?

for an ls, you should get a 4-2-1 header low - midrange help, for an ls, you won't be getting much help in highrange with 4-1 + you'll get more use out of the low-mid. don't go ceramic (cheaper metal that rust later on and looks like poo and cracks), might as well go stainless steal (heats up and turns purple, kinda looks cool IMO). you can get top of the line DC header 4-2-1 or i bought the Greddy which is cheaper and just as good IMO.

Dc header i believe is... 50-100$ more expensive then greddy header but i don't think it's worth the extra buck for header.

www.importhorizon.com Or www.adventon.com i forget which but i found those to have the cheapest prices on the greddy header.

if you really love her, get her a turbo kit.