I don't know how much my opinion means to you but I am actually in the process of doing my entire exhaust over. From headers back and I've done more research than you can possilby imagine. I would recommend at least replacing the Hpipe if you still have the stock one on there. It is pretty restrictive. If you don't mind switching back to the stock one for inspection (if you have emissions testing like I do
) I would go with an off road H.
And if you have the money, you should just get the headers done while you are doing everything else.
It all really depends on your budget. If you have the money to buy good products, go for it. If you don't, don't waste your money on lousy brands just to do the work, save up and buy something decent.
Just my .02.
Scott