the 150 is rated at the crank. They usually put down between 110-130 to the wheels.
I have seen a stock 2.4 put 143 to the wheels. My 02 with the GMPP S/C and a full exhaust put 191 to the wheels. All I did was install the S/C and a complete exhaust (stans system).
My 2.4 put 115 to the wheels, but i was runnning way lean
You also have an auto (according to your profile), this will make a difference.
How much of a difference is the auto going to make? Like 5 horse?
I have heard that Manual transmissions lose roughly 15% of power to the wheels, and Automatics lose roughly 20% to the wheels.
Your motor makes so much HP at the crank, but you lose some of that power through the drivetrain to the wheels. But manuals lose less power going to the wheels, because you control the shifts....but don't count auto trannys out
they are good too...
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