Flashpaq/Exhaust/CAI?

[Dr. Evil]

The Pentastar has its throttle body mounted on a large intake plenum, then then has an intake runner going to each cylinder's intake port. The fuel injectors are in the lower intake manifold, inside each individual runner, very close to the intake ports. A throttle body spacer will have no impact on how the fuel mixes with the air, and will have very little impact on the volume of the intake plenum. The intake plenum itself is likely already acoustically tuned to enhance airflow at certain rpm ranges. A spacer could actually make things worse at those rpm ranges.

Pickles - does this paragraph also apply to the older 3.8 engine that I have? No Pentastar for me.

[UselessPickles]

Pickles - does this paragraph also apply to the older 3.8 engine that I have? No Pentastar for me.

Yeah, same general design for the 3.8. And pretty much any engine from the last 20 years.