Debating BBK headers....advice?

Hey guys (and gals). I'm debating on throwing some BBK shorty headers on the Stang and I was wondering if anyone else had already done that and whether or not you're happy with them. What kind of difference did you see? And for those who haven't done it, what kind of difference do you think I would see/hear? Also, will there be any major issues with installation because I have dual exhaust? Just looking for some feedback basically on whether or not it's worth it to get it done. All advice is appreciated. Thanks in advance.

Well I don't think I'm going to be able to do them after all. I can swing the $300 for the headers, no problem.....but the best I've been able to get on install is $650, which is just insane. And that's coming from the shop that did my exhaust setup and has done exhaust work for me on 6 vehicles in the past. Apparently, header swaps on V6 Mustangs of this body style are extremely difficult. Am I getting fed a bunch of junk...or is it really that hard? They estimated they'd need me to leave the car there from open to close but they could have it done in a day. I don't have a jack or anything like that so doing it myself might be hard.

Thanks by the way for the responses. Do you guys think it's worth that kind of investment? I was looking to do the chrome headers, but since ceramic is apparently the way to go, then that's what I'd be looking at. But man, that's a lot of cash for 15 horses.....maybe I should look into underdrive pulleys first?

Open to suggestions.

Okay, I guess I'll just have to save up some more money. The ceramic headers run $389 which isn't really an issue, but $650 is still my best install price. Apparently they have to lift the engine out in order to properly install them..not sure on the specifics. These headers are BBK shorty headers...I didn't see an option for long tube. So with the price of the part and install, I'm running about the same price as my new rims and tires would run me....ah debates, debates...lol. At any rate, I'm a few weeks out if I decide to do either one. Wishful thinking never hurt anyone, right?
Thanks for the advice everyone. I'll update everyone when something happens.