Keep them for a while so as when you do change them out you will at least know which way it ran the best. Also keep your old parts. More and more different communities are going to stronger laws on how much noise you can make. Especially if you plan on travel.
I did my 1000 mile service at 600 miles so I could do the Stage 1 A/C, Big Radius pipes and a SERT dyno tune....I have about 1150 miles on it now and all is well.
Why wait?? Put them on now and start enjoying them. You know, even if we said you should wait, those things will keep calling you and keeping you up at night until you break down and install them......do it! Never, ever, ever, keep a girl waiting!