What is the most horsepower I can make from a 2.4L I-4 cylinder engine from

[sprayedss3]

a Chevrolet Cobalt SS coupe? It has 173 hp and 163 lbs. torque stock.

 

[ndngiverrr]

For the money its going to cost you to eek out a few ponies out of 4 banger might as well get a rear wheel drive Camaro or a Monte SS. IMO.

 

[SVOMAN]

300 hp would be 2 hp per cubic inch

 

[nes2neo]

With regular bolt ons such as Mufflers, Cold Air Intake, and better plugs and wires I wolud say approximately 10 to 12 HP. With a Turbo or Supercharger I would suspect anywhere from 200 to 225 HP.

 

[bigoilman]

Well, Chevrolet got over 1200hp from the Ecotec I-4 they built for a Cobalt so even that's possible!

Realistically, I'd say a little over 200 hp.