Staintunes for sound and freer flow. Great if you have intake mods to match.
TORs are a good, cost effective option with good sound, albeit with a bit of a bark, strong torque and moderate power increase.
Jardines for noise (ie they're raucous) and power gain (with the right tune). Quality control issues - as documented on here by others so don't shoot me - and poor fit - also documented and I've seen it.
Preds/Carpenter for outright performance but probably a bit of a waste without other intake and engine mods. Personally, I'm not a fan of the swept back look.
Ponters headers (Reband) probably in the same category as Preds and Carp but look soooo much better.
Perfect Storms - Gothlander has them and I want 'em.
How much money you got?