The best replacement for glasspacks is flowmaster.

The best alternatives to glasspacks are rated as following:
★★★★★  flowmaster
★★★★  mufflers
★  flowmaster mufflers
  flowmasters

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

Other search terms related to glasspacks and their ratings are:
★★★★★ mufflers
★★★ flowmasters
You have in mind a companion for glasspacks and it is not yet here? Propose!



Google Trends

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glasspacks
flowmaster
mufflers