diff --git a/MC/bin/o2dpg_sim_workflow.py b/MC/bin/o2dpg_sim_workflow.py
index 01310510b..4805db9b5 100755
--- a/MC/bin/o2dpg_sim_workflow.py
+++ b/MC/bin/o2dpg_sim_workflow.py
@@ -30,6 +30,8 @@
 parser.add_argument('-ptHatBin',help='pT hard bin number', default=-1)
 parser.add_argument('-ptHatMin',help='pT hard minimum when no bin requested', default=0)
 parser.add_argument('-ptHatMax',help='pT hard maximum when no bin requested', default=-1)
+parser.add_argument('-weightPow',help='Flatten pT hard spectrum with power', default=-1)
+
 parser.add_argument('-ptTrigMin',help='generated pT trigger minimum', default=0)
 parser.add_argument('-ptTrigMax',help='generated pT trigger maximum', default=-1)
 
@@ -122,6 +124,9 @@ def getDPL_global_options(bigshm=False,nosmallrate=False):
    PTTRIGMIN=float(args.ptTrigMin)  
    PTTRIGMAX=float(args.ptTrigMax) 
 
+   ## Pt Hat productions
+   WEIGHTPOW=int(args.weightPow)
+
    # Recover PTHATMIN and PTHATMAX from pre-defined array depending bin number PTHATBIN
    # or just the ones passed
    PTHATBIN=int(args.ptHatBin)  
@@ -185,7 +190,7 @@ def getDPL_global_options(bigshm=False,nosmallrate=False):
    SGN_CONFIG_task=createTask(name='gensgnconf_'+str(tf), tf=tf, cwd=timeframeworkdir)
    if GENERATOR == 'pythia8':
       SGN_CONFIG_task['cmd'] = '${O2DPG_ROOT}/MC/config/common/pythia8/utils/mkpy8cfg.py \
-                --output=pythia8_'+ str(tf) +'.cfg \
+                --output=pythia8.cfg \
 	              --seed='+str(RNDSEED)+' \
 	              --idA='+str(PDGA)+' \
 	              --idB='+str(PDGB)+' \
@@ -193,6 +198,8 @@ def getDPL_global_options(bigshm=False,nosmallrate=False):
 	              --process='+str(PROCESS)+' \
 	              --ptHatMin=' + str(PTHATMIN) + ' \
 	              --ptHatMax=' + str(PTHATMAX)
+      if WEIGHTPOW   > -1:
+            SGN_CONFIG_task['cmd'] = SGN_CONFIG_task['cmd'] + ' --weightPow=' + str(WEIGHTPOW)
       workflow['stages'].append(SGN_CONFIG_task) 
    # elif GENERATOR == 'extgen': what do we do if generator is not pythia8?
                    
diff --git a/MC/config/PWGGAJE/ini/hook_jets.ini b/MC/config/PWGGAJE/ini/hook_jets.ini
index 635067870..054922509 100644
--- a/MC/config/PWGGAJE/ini/hook_jets.ini
+++ b/MC/config/PWGGAJE/ini/hook_jets.ini
@@ -1,5 +1,5 @@
 [GeneratorPythia8]
-config=pythia8_jets.cfg
+config=pythia8.cfg
 hooksFileName=${O2DPG_ROOT}/MC/config/PWGGAJE/hooks/jets_hook.C
 hooksFuncName=pythia8_userhooks_jets()
 
diff --git a/MC/config/PWGGAJE/ini/hook_prompt_gamma.ini b/MC/config/PWGGAJE/ini/hook_prompt_gamma.ini
index d7e8d1bac..fc65758a6 100644
--- a/MC/config/PWGGAJE/ini/hook_prompt_gamma.ini
+++ b/MC/config/PWGGAJE/ini/hook_prompt_gamma.ini
@@ -1,5 +1,5 @@
 [GeneratorPythia8]
-config=pythia8_dirgamma.cfg
+config=pythia8.cfg
 hooksFileName=${O2DPG_ROOT}/MC/config/PWGGAJE/hooks/prompt_gamma_hook.C
 hooksFuncName=pythia8_userhooks_promptgamma()
 
diff --git a/MC/config/PWGGAJE/ini/trigger_decay_gamma.ini b/MC/config/PWGGAJE/ini/trigger_decay_gamma.ini
index d60e55e54..d235ed515 100644
--- a/MC/config/PWGGAJE/ini/trigger_decay_gamma.ini
+++ b/MC/config/PWGGAJE/ini/trigger_decay_gamma.ini
@@ -1,5 +1,5 @@
 [GeneratorPythia8]
-config=pythia8_jets.cfg
+config=pythia8.cfg
 
 [TriggerExternal]
 fileName=${O2DPG_ROOT}/MC/config/PWGGAJE/trigger/decay_gamma_jets.C
diff --git a/MC/config/PWGGAJE/ini/trigger_prompt_gamma.ini b/MC/config/PWGGAJE/ini/trigger_prompt_gamma.ini
index f921ba276..535a54283 100644
--- a/MC/config/PWGGAJE/ini/trigger_prompt_gamma.ini
+++ b/MC/config/PWGGAJE/ini/trigger_prompt_gamma.ini
@@ -1,5 +1,5 @@
 [GeneratorPythia8]
-config=pythia8_dirgamma.cfg
+config=pythia8.cfg
 
 [TriggerExternal]
 fileName=${O2DPG_ROOT}/MC/config/PWGGAJE/trigger/prompt_gamma.C
diff --git a/MC/config/common/pythia8/utils/mkpy8cfg.py b/MC/config/common/pythia8/utils/mkpy8cfg.py
index f02c196b8..25500bb53 100755
--- a/MC/config/common/pythia8/utils/mkpy8cfg.py
+++ b/MC/config/common/pythia8/utils/mkpy8cfg.py
@@ -29,6 +29,9 @@
 parser.add_argument('--ptHatMax', type=float,
                     help='The maximum invariant pT')
 
+parser.add_argument('--weightPower', type=float,
+                    help='Weight power to pT hard spectrum')
+
 parser.add_argument('--output', default='pythia8.cfg',
                     help='Where to write the configuration')
 
@@ -103,6 +106,10 @@
     fout.write('PhaseSpace:pTHatMin = %f \n' % (args.ptHatMin))
 if args.ptHatMax is not None :
     fout.write('PhaseSpace:pTHatMax = %f \n' % (args.ptHatMax))
+if args.weightPower is not None :
+    fout.write('PhaseSpace:bias2Selection = on \n')
+    fout.write('PhaseSpace:bias2SelectionPow = %f" \n' % (args.weightPower))
+
 fout.write('\n')
 
 fout.write('### <-- generated by mkpy8cfg.py \n')