The best replacement for resonator is muffler.

The best alternatives to resonator are rated as following:
★★★★★  muffler
★★★  glasspack
★★★  crystal
★★★  no resonator
★★★  dobro
★★★  open back banjo
★★  catalytic converter
★★  acoustic
★  straight pipe
★  muffler difference
★  oscillator
★  crystal oscillator
★  open back
★  high flow cat
★  test pipe
★  silencer
  acoustic guitar
  glass pack
  open backed banjo
  chambered muffler
  hot dog
  glasspack muffler
  second muffler

Your alternative for resonator is not listed? Suggest!
Speaking about resonator, one probably shouldn't forget about glasspack.

Other search terms related to resonator and their ratings are:
★★★★★ glasspack
★★★★ flowmaster
★★★★ pipe
★★★ infinite possibilities
★★★ muffler
★★★ straight pipe
★ tip
★ magnaflow
x pipe
You have in mind a companion for resonator and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of resonator in all years. Click on graph for more.
resonator
muffler
glasspack