LTs and dont look back!! Best and first mod for every LSX owner in my opinion.
You can look into "defoulers" that "might" prevent a CEL but remember that they are for "Off Road Use Only."
Everyone seems to love Kooks and ARH since they are the most expensive and all that jazz.
I've used ARH's units on our cars and they are nice. But they aren't the only band in town.
If you're going to spend that kind of money, compare both of those to LG Super Pros. They are pretty darn good as well.
But if you really want bang for buck, just make sure and shop around and do like everyone says....support American.
Best Wishes and Welcome!!
Ivan