It depends on if you are going with shorties, long ones, equal length, or non equal length. It will really only add 1-10 horsepower depending on the header and exhaust system.
About 225 stock 5.0
Not Much!
225 horsepower at 4200 RPM and 300 ft-lbs torque at 3200 RPM
225 hp ( at 4200 RPM and 300 ft-lbs torque at 3200 RPM )
sell the car
standard engine has about 280-345 horsepower ======================================================== A 1990 Ford Mustang 5.0 is rated at ( 225 horsepower from the factory )
225 horsepower at 4200 RPM and 300 ft-lbs torque at 3200 RPM
on the driver's left side
Because its a ford
226
about 135 140bhp
The 1990 Ford Mustang 2.3L SOHC had 88HP