Originally Posted by chaotichoax

So you decided you want to modify your Evo?
Intake:

Many will tell you that a stock intake box with a drop in element is your best bet. This solution is good up until about 400whp. There is nothing wrong with that solution but an open filter intake will yield gains. Some open filters use the stock intake pipe some require their own. When upgrading the intake a tune is very important. Especially if you eliminate the stock rubber intake pipe and substitute it for a metal one. The intake pipe wreaks havoc on your MAF readings and cause a jumpy idle. They can even cause the car to stall in certain situations.

- Some open filters are dry and some require oiling.
- If you replace the factory intake pipe, be prepared to deal with an erratic idle.
- A tune is needed to see gains and improve drive ability.