What other mods do you have? A turbo upgrade is pointless on a stock car. With a turbo upgrade, if it is a fair sized upgrade, you will need fuel and engine management. But there are easier ways than a turbo upgrade if your car is stock. Telling people what you have on your car will make for an easier response.

Stephen

 

Yeah you should start with up/dp/exhaust and open up the exhaust a little. Starting with a turbo upgrade will just cause problems without anytime of management like fuel and timing and such. Once you get done with the exhaust I would probably start by getting some engine management like the Link, UTEC, etc. Just anything that you will be able to tune. Me personally would make my first mod suspension and tires/wheels. But if you are just looking for power do the exhaust system first.

Stephen

 

You also need some kind of engine management. Yes fuel system is also needed. An intercooler only depending on how big of a turbo you are going to get. There are some simple equations to determining if an IC will remove the majority of the heat that is being produced from the turbo. If you start running too much boost you will need to upgrade the pistons, crank, con rods, etc because your compression ratio will be destroyed by running tons of boost. I am not sure what boost the ej20 is good to, but it probably isn't absurdly high.

Stephen

 

it's going to take soooo much more than a new turbo to put that on your liscence... think about it.

 

You will need someway to deliver more fuel(bigger injectors, fuel rails, etc) and you will also need some way to control your timing, your boost, your A/F ratio, etc. There is a lot that goes into putting more boost into an engine(assuming you would like to keep the engine for a while.)

Stephen