diff --git a/banchanHelp.sh b/banchanHelp.sh
index af7294c..eab22e4 100755
--- a/banchanHelp.sh
+++ b/banchanHelp.sh
@@ -6,7 +6,7 @@
 cd ../..
 TOP="${PWD}"
 
-message='usage: banchan <module> ... [arm|x86|arm64|x86_64] [eng|userdebug|user]
+message='usage: banchan <module> ... [<product>|arm|x86|arm64|x86_64] [eng|userdebug|user]
 
 banchan selects individual APEX modules to be built by the Android build system.
 Like "tapas", "banchan" does not request the building of images for a device but
@@ -19,6 +19,11 @@
 The module names should match apex{} modules in Android.bp files, typically
 starting with "com.android.".
 
+The product argument should be a product name ending in "_<arch>", where <arch>
+is one of arm, x86, arm64, x86_64. It can also be just an arch, in which case
+the standard product for building modules with that architecture is used, i.e.
+module_<arch>.
+
 The usage of the other arguments matches that of the rest of the platform
 build system and can be found by running `m help`'
 
diff --git a/envsetup.sh b/envsetup.sh
index f4e5f4e..e4b547c 100644
--- a/envsetup.sh
+++ b/envsetup.sh
@@ -799,17 +799,19 @@
 function banchan()
 {
     local showHelp="$(echo $* | xargs -n 1 echo | \grep -E '^(help)$' | xargs)"
-    local arch="$(echo $* | xargs -n 1 echo | \grep -E '^(arm|x86|arm64|x86_64)$' | xargs)"
+    local product="$(echo $* | xargs -n 1 echo | \grep -E '^(.*_)?(arm|x86|arm64|x86_64)$' | xargs)"
     local variant="$(echo $* | xargs -n 1 echo | \grep -E '^(user|userdebug|eng)$' | xargs)"
-    local apps="$(echo $* | xargs -n 1 echo | \grep -E -v '^(user|userdebug|eng|arm|x86|arm64|x86_64)$' | xargs)"
+    local apps="$(echo $* | xargs -n 1 echo | \grep -E -v '^(user|userdebug|eng|(.*_)?(arm|x86|arm64|x86_64))$' | xargs)"
 
     if [ "$showHelp" != "" ]; then
       $(gettop)/build/make/banchanHelp.sh
       return
     fi
 
-    if [ $(echo $arch | wc -w) -gt 1 ]; then
-        echo "banchan: Error: Multiple build archs supplied: $arch"
+    if [ -z "$product" ]; then
+        product=arm
+    elif [ $(echo $product | wc -w) -gt 1 ]; then
+        echo "banchan: Error: Multiple build archs or products supplied: $products"
         return
     fi
     if [ $(echo $variant | wc -w) -gt 1 ]; then
@@ -821,8 +823,8 @@
         return
     fi
 
-    local product=module_arm
-    case $arch in
+    case $product in
+      arm)    product=module_arm;;
       x86)    product=module_x86;;
       arm64)  product=module_arm64;;
       x86_64) product=module_x86_64;;