K&R sells pretty good kits ! Plus the car makes a very sexy noise
It is better to have a cold air intake because cold air + gas ignites easier and better.
You will however not have any significant performance boost ; around 8 or 9 hp on 1ZZ-FE with the K&R kit plus your MPG will decrease. (Cold or not, more air = more gas, the air/gas ratio never lies haha)
If you decide to do a do-it-yourself project instead, you will need to drill a hole with a plug in order to fit the EVAP air hose. You will need to drill a medium hole for the canister closing valve and a larger one for the mass air flow meter. Be sure to drill them at the same distance like the stock air hose.