try edelbrock, in a turbo & high-tech performance a skunk2 really lost power around 5000-7000rpm(like 10hp), it needed a remapped fuel curve fuel pressure regulator and ground wires to make i.3 peak horse power, which the highest gain was only after 8900rpm which was 12.1 hp and they claim they couldhave gotten over 20hp at 9500rpm, but u think about it thats only 10-18hpaverage for 600rpm, but lost more than 10average hp in the range u need to accelerate u foward, plus all the money u spent far as the manifold a fuel controller and ground wires, and this is a lsvtec, b16head ls block, i need a stock b16 intake manifold, and i'll be happy with that or use a edelbrock