The best replacement for m6 is m5.

The best alternatives to m6 are rated as following:
★★★★★  m5
★★★★★  m3
★★★  m7
★★★  gtr
★★★  r8
★★★  911
★★  650i
★★  z06
★★  corvette
★  rs7
★  m4a3e2
★  mercedes
★  m4
★  m6 ttl
★  sl63
★  m7 leica
★  mp
★  c63
  s5
  sl55
  rs5
  m1
  zo6
  10-32
  a4
  a1
  m6ttl
  6 series
  zl1
  sherman jumbo
  audi r8
  650
  revel m22
  911 turbo
  m6 toll
  m6x
  m4 p
  mxt
  leica m8
  cls55
  e55
  s6
  kv1s
  bmw m5
  v10

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Google Trends

Scale is based on the average worldwide traffic of m6 in all years. Click on graph for more.
m6
m5
m3