Your best and cheapest bet would be to put it right behind your Y-pipe because if you were to put 2 before the cats without a tune the Check Engine Light would turn on whenever you opened them and would stay on until you clear the codes. Basically if want them before the cats you would need 2...
I mainly like it because it looks like it's flush with the headlights unlike the one on my 97 which sticks out and is bubbly. The inserts don't really matter to me.
So I was looking at corner lights on ebay and came across a picture of a grille that I really like but I have no idea were I can find one. To me it almost looks like a grille from a 454 SS, but I can't tell for sure.
If I'm not mistaken O'riely's(at least in my town) has a Bulldog Security auto start kit on clearance for about $20 and that's what I installed in my truck the other day. I would just install that if I were you. I have the oem keyless entry and that only worked only half the time at a descent range.
I did quite a bit of research on these motors when I was looking into getting a Feiro and putting a supercharged 3.8l, which is a pretty popular swap. If I'm not mistaken you can make quite a bit of power out of them with out to much work or money but unfortunately they don't bolt in to any rwd...