intake manifold

I was thinking on gettin a high performance intake manifold just dont know which brand is the best of close to it. Also about how much hp will this add because i will be adding cams also with this and then heads this summer so i need to get it flowing really well. also i heard somewhere on some other forum that high performance intake manifolds dont make very much more power on a 99+ gt is this true? im hoping an intake manifold will give me 15rwhp or so.

Thanks

intakes dont do that much stock but work well when u do the whole H/C/I swap. so how many cams are you gonna get?

im gonna be going with the Vt stage 1s SOHC i gotta get myself ready for this spring i finally have realized what comes along with owning a mustang everyone wants to race me to try there luck. actually a truck might hold its own against me but he also has 8gs in his whole project too its a 1985 dodge truck thats all i can get out of him so i gotta get set for him and then the sti which wont be hard at all cause he just got owned by an srt that was modded by about 8+ cars so i think ive got him he is a high 13 sec. This is def awesome though