hi my 05 mustang gt is all stock but i do have a pro charger sc on my stang i was thinking about getting the ford racing manifold is it worth the buy and should get a bigger throttle body or just keep the stock 1 when i get the manifold. i also wanted to get bbk shorty headers if i get all of this i will have to get my car retuned I have the diablo is it worth the buy?