The best replacement for jb4 is cobb.

The best alternatives to jb4 are rated as following:
★★★★★  cobb
★★★★★  dinan
★★★★★  vishnu
★★★★  procede
★★★  jb+
★★  procede v5
★★  jb3
★★  cobb n55
★★  cobb v3
★  cobb n54
★  cobb ap
★  335i jb4
  giac
  cobb bmw

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Speaking about jb4, one probably shouldn't forget about cobb.

Other search terms related to jb4 and their ratings are:
★★★★★ cobb
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Google Trends

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