K&N filters, Performance chips - Are they worth it?

[kingison]

My MKIII is completely stock 7mGE. It is driven by a docile automatic transmission. I would like to bump up the horsepower a little without going crazy on all sorts of mods.

I am not interested in the cost to put on a cold air intake. Would it be worth it however to swap the fram air filter with a K&N without doing the full kit? I read somewhere it would be pointless but want your opinions.

I have also considered a performance chip, but see very conflicting information in regards to their efficiency and the actual increase in power.
http://www.performancechipsdirect.com/Toyota/Supra/

Thanks!