The best replacement for isf is m3.

The best alternatives to isf are rated as following:
★★★★★  m3
★★★  c63
★★★  m5
★★★  is350
★★  bmw m3
★★  cts v
★  rs4
★  m3 top gear
★  evo x
★  cts-v
  audi s4
  rcf
  audi rs4
  audi a5
  csf

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Google Trends

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isf
m3
c63