found these infos from other member here posted on this thread
http://www.k20a.org/forum/showthread.php?t=37212
Weight: 5.6kg
Throttle body opening: 64mm (no idle bypass)
Runner Length *1: 25.5cm
Runner Length *2: 19.5cm
Runner width: 4.8cm (min)
Runner width *1: 5.8cm (max)
Runner width *2: 5.1cm (max)
Individual runner volume: 295cc
Individual velocity stack volume: 105cc
Total runner volume *1: 1600cc
Total runner volume *2: 1180cc
Plenum volume *1: 2530cc
Plenum volume *2: 2950cc
Torque Chamber volume: 800cc
Total manifold volume: 4930cc
*1 with velocity stacks fitted
*2 without velocity stacks fitted