The best replacement for x pipe is h pipe.

The best alternatives to x pipe are rated as following:
★★★★★  h pipe
★★★★★  y pipe
★★★  straight pipe
★★  true duals
★  prochamber
★  no x pipe
★  true dual
★  open headers
★  straight pipes
  dual exhaust
  h
  catted x pipe

Your alternative for x pipe is not listed? Suggest!
Speaking about x pipe, one probably shouldn't forget about flowmasters.

Other search terms related to x pipe and their ratings are:
★★★★★ flowmasters
★ magnaflow
★ glass packs
★ resonator
slp
straight pipes
You have in mind a companion for x pipe and it is not yet here? Propose!



Google Trends

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x pipe
h pipe
y pipe