nothing unless you reprogram the computer.
cold air intake
To increase the horsepower of a diesel engine you need to put either a turbo charger or a supercharger on it. Cold air intake will also help.
From 5 to 10 horsepower.
I've looked around and pretty much everyone says about 12hp. Hope this helps :)
Add a free flow exhaust and a cold air intake free flow air filter. This will give you slightly more h.p. To get some real horsepower you can install a turbo charger or supercharger but they are expensive.
10 horsepower.
about 2 wheel horsepower
typically at least 1MPG up to 3-4MPG a few and up to 30 HP in some instances
what year
In order to do that; putting on any kind of cold air intake or super charger requires a diffrent kind of pistons to have a lower compression in order to work with the supercarger or any other kind of enhancement.
The cold air intake may add 5-10 hp to the 335 it was built with.
Cold air intake, supercharger and down pipes.