diff --git a/changelog.txt b/changelog.txt
index 6efe98e..2e97bf6 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -8,6 +8,10 @@ Date: 2022-08-09
     - General balance: Tungsten plates required for piercing ammunition reduced.
     - General balance: Tungsten ingredients required for oil refinery & chemical plant increased.
     - General balance: For some mod loadouts, steel no longer required for assembling machine 2
+    - SE+K2 balance: When using Space Exploration 0.6 & Krastorio 2, speed modules are now removed
+      from rocket science (rocket tech cards), but many more rocket engine nozzles are used.
+      This slightly balances the jump in complexity from chemical to rocket science.
+      Speed modules are still used later in optimization science.
 ---------------------------------------------------------------------------------------------------
 Version: 0.6.6
 Date: 2021-08-02
diff --git a/tungsten-recipe-updates.lua b/tungsten-recipe-updates.lua
index c891b74..01bd88c 100644
--- a/tungsten-recipe-updates.lua
+++ b/tungsten-recipe-updates.lua
@@ -170,7 +170,11 @@ if mods["space-exploration"] then
   util.add_product("se-particle-beam-shielding-data", {name= cuw, amount=1, probability=0.20})
 
   --rocket
-  util.add_ingredient("se-rocket-science-pack", "rocket-engine-nozzle", 1)
+  if mods.Krastorio2 and string.sub(mods["space-exploration"], 1, 3) >= "0.6" then
+    util.replace_ingredient("se-rocket-science-pack", "speed-module", "rocket-engine-nozzle", 8)
+  else
+    util.add_ingredient("se-rocket-science-pack", "rocket-engine-nozzle", 1)
+  end
   util.add_ingredient("se-spaceship-rocket-engine", "rocket-engine-nozzle", 4)
   util.add_ingredient("se-cargo-rocket-section", "rocket-engine-nozzle", 5)
   util.add_ingredient("se-cargo-rocket-section-beryllium", "rocket-engine-nozzle", 5)