The best replacement for l2 is l3 cache.

The best alternatives to l2 are rated as following:
★★★★★  l3 cache
★★★  l3 switch
★★★  l3
★  l5
★  l1 cache
★  l6
★  l3 waves
★  xpel
★  l1
  l2s
  t6
  l3 maximizer
  hadley small
  atac xl50
  2mb l2

Your alternative for l2 is not listed? Suggest!
Speaking about l2, one probably shouldn't forget about ead.

Other search terms related to l2 and their ratings are:
★★★★★ ead
★★ ssn
★ bone biopsy at l1 and l2
mdr3 l2
You have in mind a companion for l2 and it is not yet here? Propose!



Google Trends

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l2
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