diff --git a/py/torch_tensorrt/fx/input_tensor_spec.py b/py/torch_tensorrt/fx/input_tensor_spec.py
index 910bb8228e..2fd49b9e5d 100644
--- a/py/torch_tensorrt/fx/input_tensor_spec.py
+++ b/py/torch_tensorrt/fx/input_tensor_spec.py
@@ -7,12 +7,7 @@
 
 
 def generate_input_specs(inputs, lower_setting, additional_inputs=None):
-    # AIT lower setting doesn't have explicit_batch_dimension field and
-    # we just return None.
-    if not hasattr(lower_setting, "explicit_batch_dimension"):
-        return None
-
-    # dynamic_batch is TRT only flag. It does not exist in AIT lower setting
+    # dynamic_batch is TRT only flag.
     if (
         not lower_setting.explicit_batch_dimension
         or lower_setting.dynamic_batch is False
diff --git a/py/torch_tensorrt/fx/lower.py b/py/torch_tensorrt/fx/lower.py
index c99004585a..6d052fc34e 100644
--- a/py/torch_tensorrt/fx/lower.py
+++ b/py/torch_tensorrt/fx/lower.py
@@ -232,7 +232,7 @@ def __call__(
                 x.half() if x is not None and x.dtype == torch.float32 else x
                 for x in inputs
             )
-        pm = self.lower_pass_manager_builder.build_lower_pipeline(
+        pm = self.lower_pass_manager_builder.build_trt_lower_pipeline(
             inputs, additional_inputs
         )
 
diff --git a/py/torch_tensorrt/fx/passes/lower_pass_manager_builder.py b/py/torch_tensorrt/fx/passes/lower_pass_manager_builder.py
index ee09da1ce5..98c6314f18 100644
--- a/py/torch_tensorrt/fx/passes/lower_pass_manager_builder.py
+++ b/py/torch_tensorrt/fx/passes/lower_pass_manager_builder.py
@@ -121,7 +121,7 @@ def _split_pass(self) -> PassManager:
         )
         return PassManager.build_from_passlist(passes)
 
-    def _lower_pass(self) -> PassManager:
+    def _trt_lower_pass(self) -> PassManager:
         def lower_func(split_result: SplitResult) -> nn.Module:
             if (
                 hasattr(self.lower_setting, "explicit_batch_dimension")
@@ -169,7 +169,51 @@ def lower_func(split_result: SplitResult) -> nn.Module:
 
         return PassManager.build_from_passlist([lower_func])
 
-    def build_lower_pipeline(
+    def _default_lower_pass(self) -> PassManager:
+        def lower_func(split_result: SplitResult) -> nn.Module:
+
+            for submod_name, submod_inputs in split_result.submodule_inputs.items():
+                submod = getattr(split_result.split_module, submod_name)
+
+                LOWER_SPLIT_PRE_OBSERVER.observe(submod_name, submod, submod_inputs)
+
+                # Only acc submodules will be lowered.
+                if not submod_name.startswith(split_result.non_acc_submodule_prefix):
+                    print("Now lowering submodule", submod_name)
+                    lowering_start_time = datetime.datetime.now()
+
+                    lowered_module = self._lower_func(
+                        submod, submod_inputs, self.lower_setting, submod_name
+                    )
+                    setattr(split_result.split_module, submod_name, lowered_module)
+                    LOWER_SPLIT_POST_OBSERVER.observe(
+                        submod_name, lowered_module, submod_inputs
+                    )
+                    print(
+                        f"Lowering submodule {submod_name} elapsed time",
+                        datetime.datetime.now() - lowering_start_time,
+                    )
+
+            return split_result.split_module
+
+        return PassManager.build_from_passlist([lower_func])
+
+    def build_trt_lower_pipeline(
+        self, input: Input, additional_input: Optional[Input] = None
+    ) -> PassManager:
+        self._input = input
+        self._additional_input = additional_input
+        passes = []
+
+        passes.append(self._const_fold_pass())
+        passes.append(self.graph_optimization_pass())
+        passes.append(self._split_pass())
+        passes.append(self._trt_lower_pass())
+
+        pm = PassManager.build_from_passlist(passes)
+        return pm
+
+    def build_default_lower_pipeline(
         self, input: Input, additional_input: Optional[Input] = None
     ) -> PassManager:
         self._input = input
@@ -179,7 +223,7 @@ def build_lower_pipeline(
         passes.append(self._const_fold_pass())
         passes.append(self.graph_optimization_pass())
         passes.append(self._split_pass())
-        passes.append(self._lower_pass())
+        passes.append(self._default_lower_pass())
 
         pm = PassManager.build_from_passlist(passes)
         return pm
diff --git a/py/torch_tensorrt/fx/tracer/acc_tracer/acc_ops.py b/py/torch_tensorrt/fx/tracer/acc_tracer/acc_ops.py
index 8814bf4075..be6b6700a1 100644
--- a/py/torch_tensorrt/fx/tracer/acc_tracer/acc_ops.py
+++ b/py/torch_tensorrt/fx/tracer/acc_tracer/acc_ops.py
@@ -528,7 +528,6 @@ def stack_mapper(node: torch.fx.Node, _: nn.Module) -> torch.fx.Node:
         return cat_node
 
 
-@register_acc_op_properties(AccOpProperty.pointwise, AccOpProperty.unary)
 @register_acc_op_mapping(op_and_target=("call_function", torch.clamp))
 @register_acc_op_mapping(op_and_target=("call_method", "clamp"))
 @register_acc_op
@@ -1743,7 +1742,7 @@ def quantized_conv2d(
     dilation,
     groups,
     padding_mode,
-    acc_out_ty,
+    acc_out_ty=None,
 ):
     qparams = acc_out_ty.qparams
     return torch.nn.quantized.functional.conv2d(
@@ -2041,7 +2040,7 @@ def quantized_batch_norm2d(
     weight,
     bias,
     eps,
-    acc_out_ty,
+    acc_out_ty=None,
 ):
     qparams = acc_out_ty.qparams
     return torch.ops.quantized.batch_norm2d(