The best replacement for 4 cylinder is 6 cylinder.

The best alternatives to 4 cylinder are rated as following:
★★★★★  6 cylinder
★★★★  v6
★★★  8 cylinder
★★★  v8
★★  5 cylinder
★★  6
★  6 cylinder cars
★  6 cylinder car
★  6 cylinder engines
★  6 cylinder camry
★  6 cylinder suv
★  v twin
★  v6 tacoma
★  6 cylinder engine
★  v6 engine
★  v4
  2 cylinder motorcycles
  v8 engine
  2 cylinder
  6 jeep
  3 cylinder
  v6 on an accord
  v6 honda accord

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Speaking about 4 cylinder, one probably shouldn't forget about v6.

Other search terms related to 4 cylinder and their ratings are:
★★★★★ v6
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4 cylinder
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