The best replacement for viper is corvette.

The best alternatives to viper are rated as following:
★★★★★  corvette
★★  z06
★★  vette
★★  zr1
★★  python
★★  compustar
★★  clifford
★  ferrari
★  gtr
★  cobra
★  hayabusa
★  stingray
★  supra
★  bugatti
  apache
  incisor
  ford gt
  lamborghini
  adder
  mustang
  gt500
  superwinch
  python alarm
  c7
  busa
  civic
  cobra helicopter
  cobra top gear
  semi
  zo6
  2013 corvette
  mclaren
  viper
  cobra snake
  temple viper
  widow
  broodlord
  honda
  f16
  corvette z06
  nikon monarch
  nsx
  porsche 911
  chevy corvette
  sg
  shelby
  htc evo
  lg optimus elite
  lambo
  king cobra
  venomancer
  clifford alarms
  arachnid
  autopage
  prestige

Your alternative for viper is not listed? Suggest!
Speaking about viper, one probably shouldn't forget about turbo timer.

Other search terms related to viper and their ratings are:
★★★★★ turbo timer
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Google Trends

Scale is based on the average worldwide traffic of viper in all years. Click on graph for more.
viper
corvette
z06