[wyatth]

Removing resonators: raspier, drone, a little louder. No effect on power or smell. As the name implies, they just effect sound waves and deal with resonance.

Removing cats: louder, raspier, smellier, more power. But a good HFC will not hold back much power.

Catless setups on the street are silly, imo. Usually loud and smelly for no real benefit, unless you like obnoxious volume/rasp (quad resonator setups can mitigate this) and the smell of carbon monoxide.