The best replacement for h pipe is x pipe.

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

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

Other search terms related to h pipe and their ratings are:
★★★★★ borla stingers
★★★★ flowmasters
You have in mind a companion for h pipe and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of h pipe in all years. Click on graph for more.
h pipe
x pipe
straight pipe