I believe that the bullitt intake does not make much difference when it comes to horsepower. But obviously, it would hold up much better than the plastic mainfold. The bullitt had 265 horses I believe, but it was in the tune, as compared to the 260 horse GT. Most guys on here will probably tell you that it is only worth it if you plan to supercharge your stang; for NA, probably not.
If you plan on cams,ported heads,the bottle,or even a blower,it would be worth it in my opinion.Good deal for all that,but you will still need a few other parts to bolt her up.
ask them to send you an updated pic.. remember you get what you pay for... ask for an updated pic of everything there going to included, have them out it next to a news paper so you know there not full of S$$T