THey are pointless, save up and get a new throttle body.

 

they actually do work on some vehicles, like a 4.0L inline six on a jeep cherokee... but .....ya know.... umm......
+1

 

Yes, save your money and get the ported tb, it is a very nice mod.

 

... make expensive paperweights.

 

On a wet manifold like a carb or some other primitive fuel injections spacers are very effective. On dry manifolds, which most modern vehicles have, they're worthless because there's nothing but air going through them.

I had a 92 chevy with a TBI 350 and put a CFM-tech spacer on...I had to have a chip burned after the install because it ran so rich but even running rich the gains were noticeable.