Pros/cons of adding velocity stack on single downdraft carburator

[isa1023]

http://en.wikipedia.org/wiki/Velocity_stack





Questions:

• Pwede ba to sa stock single downdraft carburator?
• Any practical pros aside from smooth air entry?
• Any practical cons aside from increased fuel consumption?
• San makakabili nito? I tried calling A&M Carburators sa Kamuning wala daw silang ganyan

TIA