custom intake manifolds have always been tricky.

years ago AVO tried modifying a standard one by adding extra capacity to the underside of the plenum and resulted in going backwards.

aps ran a few "prototypes" of a twin entry only to conclude that apart from looking diffrent it didn't serve of any performance advantage.

latest results still show the corsa veloce still producing below factory power levels

the only real power producer was the old explicits twin speedworks creation which utimately proved the death of the jun engine due to its unequel compesation between both sides.

regardless of the extra volume of an aftermarket manifold affords you, unless you can get it into the cylinder heads it serves of little function.

twin throttle body's worked in explicits case, im hoping four will do likewise for me using the tomei.