Throttle Body Spacers helped greatly with CARBURETOR engines
here is the best explanation about them that i could find
These spacers mainly benefit older engines. In particular, those with fuel injection systems that have the fuel go directly into the throttle body, where it then mixes with air before going into the combustion chamber. It also can help with carburetor systems.
However, if the vehicle has a multi-port fuel injection system or other top of the line system, then that small change in the air vortex will not make any difference to the performance, torque or horsepower.
Therefore, before you go out and purchase a spacer, make sure your engine can actually benefit from having this upgrade.
2009 Ram 1500 SLT QC, HEMI , 3.55 axle, Bushwacker flares, soft tonneau, Line_X, DEBO Step, Mag-Hytec, Weathertech mats
2016 Ram 3.0 diesel 3.55 w/LSD, G2 tonneau, Line-X, Weathertech mats, Mag-Hytec differential cover, Nfab bars, CB radio, Autonet wi-fi router, EGR bug deflector