"lower horsepower" is correct and usable in written English.
You can use it when you want to refer to an engine or motor with a smaller amount of power. For example, "This lawnmower has a lower horsepower than the last model."
The automakers can adjust their prices to sell lower horsepower engines and more EV's and hybrids, but this reduces profits.
In the past, the words "low voltage" tended to scare people off because they meant lower horsepower.
With so many miles on the clock, for one of his age, there is admittedly a feasible case to be made that the engine nowadays operates at slightly lower horsepower than when Long Run appeared to have ended the Kauto Star era here, two years ago.
Also, lower horsepower costs less.
An exception to the pattern is the successful six-year-old Boxster, which is really a cheaper, convertible knockoff of the 911 with lower horsepower.
In this genre the SportWagon leads on utility, is a decent value in lower horsepower additions and certainly out-corners the RX300 and its crossover ilk.
Narrative, however, doesn't require silicon horsepower.
Mercedes seems to have built one auto shifter for both its V-6 and V-8-engined cars, and the lower-horsepower motors simply aren't well mated to the beefy transmissions.
The lower-horsepower, rear-wheel-drive version of the Huracan costs a mere $199,800 before taxes and destination charges.
Lower shaft horsepower drives, for example, may exhibit a relatively speedy decay of electrical transients in comparison to mechanical transient settling times.
NASCAR is looking to lower the horsepower from around 750 to 550 for 21 races (tracks 1.2 miles or greater) in order to bunch up the field, create side-by-side racing and more passing.
