I have a 99 GMC Jimmy, 4.3 Vortec. I am looking at a catalog that claims throttle body spacers will give up to 22 hp gain, 4 mpg and 25 ft/lbs more torque. Are they pulling my leg or what?? Any help would be greatly appreciated.. Thanks in advance. They are 1 inch and design creates a spiral flow.

spacers are a good bang for the buck. normal gains are 5-15hp depending on the engine. you may pic up 1-2 mpg at best. hope this helps.

spacers are a good bang for the buck. normal gains are 5-15hp depending on the engine. you may pic up 1-2 mpg at best. hope this helps.

Not on a 4.3L.

Actually will decrease economy and is a complete waste of money.

Not on a 4.3L.

Actually will decrease economy and is a complete waste of money.
Thanks BlazerLT. I'll just have to pass..

Thanks BlazerLT. I'll just have to pass..

Smart man, the money can be spent on better mods.

guess it depends on engine. 80-90 bucks could be spent on something better.