Appears on releases
| # | Title | Length | Track artist | Release title | Release artist | Release group type | Country/Date | Label | Catalog# |
|---|---|---|---|---|---|---|---|---|---|
| Official | |||||||||
| 1.3 | I Know | 3:49 | Engine | Superholic | Engine | Album |
| Metal Blade Records (heavy/extreme metal) | 3984-14364-2 |
| Promotion | |||||||||
| 1.6 | I Know | 3:49 | Engine | KnuckleTracks XLII | Various Artists | Album + Compilation |
| Brave Words & Bloody Knuckles (Canadian rock magazine; releases promo compilations) | BWBK61 - KT42 |
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