Quote:
Typical range of improvement over baseline is:
0 to 35 increase in horsepower,
0 to 31.85% increase in fuel economy.
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HAHA. Notice the 0 part of the 0-35% increase in hp? Well, you may gain 35% on a 1 or 2 hp engine. but 0% sounds more like the actually outcome.
Basically this thing spins the incoming air to help it enter the cylinder at a faster rate then it would normally. Now, if you had a sperate spinner for each intake runner (or real velocity stackc) this would work. but since you install it before the manifold all of the spiraling effect goes away before the air even gets to the cylinder.
This question has been posted many times before and it seems many companies are trying to trick uninformed customers into buying this peice of overprieced metal. I would avoid this thing at asll costs.