I have one from Rotational Dynamics. The one you seen on that link is the same. Honestly, I did that, added a Kick runner, Kick 1.6L head, ported and polished, Calmini Samurai mid-range cam, K&N and CALMINI Header and bored exhast all at the same time. All together, it added a big boost and kept pace with a 16v.
A Spacer just elongated the intake, allowing more time for the fuel and air to mix, resulting in better combustion, or so they say. I just like adding kewl bits.
![Cool 8)](https://www.zukiworld.com/forum/Smileys/aaron/cool.gif)