It's simply a form of variable inlet tuning. There are 8 runners, 2 for each cylinder; the butterflies close off one set of runners at low rpm to increase air velocity, and at higher rpm they open up to allow the engine to breathe. Removing the TVIS system may liberate a small amount of power at high rpm but at the expense of low rpm response.
Sun, 25 July 2004 12:54
