The best replacement for true duals is 2 into 1.

The best alternatives to true duals are rated as following:
★★★★★  2 into 1
★★★★  slip ons
★★★★  y pipe
★★★  x pipe
★★★  single in dual out
★★  h pipe
★★  power duals
  y-pipe
  single exhaust
  gmmg

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true duals
2 into 1
slip ons