http://g35driver.com/forums/intake-e...art-pipes.html

 

Not reading through the whole lot but theoretically it should improve things. Mazda use Helmholtz on the intakes but to be honest I don't think it would get you more than 1-2 bhp on a mx5. That price tag is a no no though
I think the trick is to make the chamber the right size ???

 

Looks more like a water-hammer reducer for home plumbing systems.

 

RPM - Gain
2500: +3.5whp, +7wtq
3000: +8whp, +14wtq
3500: +5whp, +8wtq
4000: +4whp, +5wtq
4500: +4whp, +5wtq
5000: +5whp, +5wtq
5500: +8whp, +8wtq
6000: +10whp, +8wtq
6500: +6whp, + 4wtq
7000: +7whp, +5wtq

Wow.

http://my350z.com/forum/intake-exhau...art-pipes.html