Spacer? Yes Yes Yes Yes, worth every penny.

Get the phenolic one, plastic, not aluminum, they isolate
the heat much better. Torque it easy or you'll break it.

And yes, a larger Throttle Body also helps.
Make sure all the factory ducting is gone too - lots of air
has to be able to get to it to work, and a K&N Filter, not
a restrictive Chinese "knock off."

You will be amazed!