Electronic ignition is a great relatively easy adjustment, also you can add a dual exhaust, upgrade your camshaft ( requires pulling the engine), and I'm not sure but possibly adding a 4 barrel carbeurator.
add about 500 horsepower.
Maybe 10
The 2005 Ford Mustang with a 4.0 V6 came stock with 210 horsepower.
The standard 3.8 liter V6 2003 Ford Mustang has 190 horsepower.
about 145 horsepower
210 Horsepower
210 Horsepower
The V6 - 2000 Ford Mustang is 190 horsepower
The 3.8 liter V6 engine in a 1996 Ford Mustang is rated at : ( 150 horsepower from the factory )
( 210 horsepower ) for the 4.0 liter SOHC , V6 engine in a 2008 Ford Mustang
The 2005 Ford Mustang V6's have 210HP
A 2002 V6 Mustang has a 193 horsepower. The 2002 V6 Camaro is 200. Check the torque on cars also, Not only horsepower.