The best replacement for sl4 is venge.

The best alternatives to sl4 are rated as following:
★★★★★  venge
★★★★  r3
★★★★  sl2
★★★  slr01
★★★  audio 10
★★★  supersix evo
★★  sl3
★★  cervelo r5
★  cannondale evo
★  dogma2
★  cervelo r3

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Google Trends

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sl4
venge
r3