Rifled Throttle Body Spacers?

[NexTnmE]

Does something like this actually work on a N/A engine, or is just like the "Tornado" crap you see on tv? I understand that a "swirling vortex of air" is faster flowing...but it has to still go through the plenum and runners before it gets where it needs to be...and by then how can it still be swirling and shit?


http://cgi.ebay.com/ebaymotors/OBX-T...00703615QQrdZ1

[SiGNAL748]

I happen to have a throttle body spacer on my car. What it basically does is lengthen your intake runners. No significant gains from what I can tell.

[Gohan Ryu]

Prelude engines are designed well enough from the factory - a throttle body mod won't produce much gains unless you've done some other engine work like higher compressions pistons and a race cam.