Getting power out of an N/A KA

[Shin_Kudo]

In the 240 world, it seems there are often only two choices considered for increasing the car's power by more than a few HP.

First, and more common, would be engine swaps, with the SR, of course, most popular.

Second, and gaining popularity, partially in retalliation to the proliferation of SR-powered cars in the US, is the KA-turbo.

But there must be a third option. It is possible to improve on the natural power and torque of the KA24 without resorting to bolt-on mods like turbochargers.

As with any car, everything from cams to pistons has the potential for improvement, along with the mechanisims on the outside of the motor.

But what parts are actually available to improve the naturally aspirated power of the KA? And how is their quality, and their pricing?

My intent is for this thread to be like the SR and KA-T FAQs, but for those who prefer the response and design of an N/A motor.