The best replacement for six pack is eight pack.

The best alternatives to six pack are rated as following:
★★★★★  eight pack
★★  flat stomach
★★  big arms
★★  eight pack abs
★  four pack
★  8 pack
★  426 hemi
★  dual quads
★  washboard abs
  biceps
  six pack
  joe the plumber
  gallon of gas
  440 magnum

Your alternative for six pack is not listed? Suggest!
Speaking about six pack, one probably shouldn't forget about love handles.

Other search terms related to six pack and their ratings are:
★★★★★ love handles
★★★ fat
You have in mind a companion for six pack and it is not yet here? Propose!



Google Trends

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six pack
eight pack
flat stomach