NO! They don't work for shit. It is NOT like a carb spacer. A carb'd intake a "wet" intake meaning it flow fuel and air through out the entire intake. Adding a spacer on a carb'd setup can optimize atomization by providing more distance to the combustion chamber for thus allowing more time for "stirring" of the mix. Dropping however much for a TB spacer is BUNK. Intake spacers (i.e. extending idividual runners) has a greater effect. EITHER WAY, they're both bullshit. If you need valvecover clearance, by all means, get an intake spacer but I wouldn't buy one to increase my power. Your money is better spent elsewhere.
