When it comes to aftermarket headers get what fits your car, no need to do all the custom modding for those. If you dont have the cast for aftermarket shorties for your car and you have a 99+ then this mod is ideal for you.
If you live in a state where there is no smog regulation then I say go for the long tubes, they are one of the better mods for your car. The LT's with midpipe and GT takeoffs will put a kick in your pants
If you already have other mods done like CAI, TB, any kind of portwork and higher ratio roller rockers the kick will be magnafied.
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