Cordia Turbo's take very well to performance modifications as long as it is being done by capable hands.

Cordia Mods FAQ?

Maintanence?
By Using good quality oil, Regular servicing and idling the car for a few minutes after a hard drive.
Are all extremely beneficial to a Cordia Turbos lifespan. :)

Exhaust System?
The best type of setup for a Cordia turbo is a mandrel bend system using mufflers with a straight through type flow design.  This is best for performance and sound quality. 
(Note :AC unleaded models should also use a hi-flow catalytic converter)
Size really depends on your budget anything from  2.5 inch up to a 3 inch system will give a definate performance increase. Going a bigger than 3 inch dump pipe from the turbo can be difficult due to engine room. 

Winding up the Boost?
A Bleed valve setup is a fairly cheap and reliable way of easily adfjusting boost pressure. 
A mild boost increase of 9-10psi is fine on a stock engine in good running order with no intercooler. Any higher and it is recomended to fit an intercooler.
Also the two factory Throttle body injectors will not be able to deliver enough fuel past the factory ecu  over boost cut point. 
AA & AB Leaded Models = 14psi
AC Unleaded Model =12psi
To run higher boost you need a modified or aftermarket ecu and run extra injectors and an upgraded fuel pump. Also it would be desirable to look at strengthening engine internals with Forged pistons etc..

Hi Flowed Turbo's?
Always use a reputable Turbo Specialist. They will be able to give you the best info on what is the most suitable turbo setup for your car. 
While the leaded model Cordia's used a big Mitsubishi TC06 turbo the AC(unleaded) Cordia used the much smaller TC05 turbo which is a bit of a restriction when it comes to making power.
One of the most  effective Cordia performancve mod's is fitting a Hybrid Mitsubishi TC06 turbocharger that uses a TC05 exhaust wheel.  This turbo setup gives you much quicker spool up time  and retains the good top end power of the TC06. Resulting in a very good powerband.
Also these days the Mitsubishi TD05 turbo as used in the Galant VR4 is becoming increasingly popular as an aftermarket turbo upgrade for a Cordia. It uses a more modern and slightly more efficient design than the old TC series Mitsubishi turbochargers.

 Blow off Valves?
A Blow off valve vents Excess pressure which is created when the throttle is closed (during gear changes or
deceleration) Which prevents turbo backspin.
Blow off valves will help increase the lifespan of your turbo.
They do not increase engine horsepower.
You will notice however a difference in performance with slightly less turbo lag after gear changes.
Blow off valves can be fitted on a Cordia Turbo to either vent to atmosphere(pshhh!) or plumbed back inline(for less lag and less noise).
In lower boost applications(eg: under 15psi) the difference is minimal with venting to atmosphere or back inline. 

Turbo Timers?
Turbo timers are not really a necessity. If you are not too fussed about sitting in your car for a couple of minutes while it idles after a hard drive. Then save your cash.

Aftermarket Engine Management?
Replacing the factory Cordia ECU with a good quality aftermarket ECU (eg: Motec, Autronic etc..) has many performance advantages. It gives you the freedom to tune your car to its best ability. 
*Ditch the Throttlebody Injection setup for multi point. (L300, Sonata, Magna) 
*Replace the factory airbox and run a Rampod style filter with sheild and intake. 
Aftermarket Engine management has numerous advantages. It is really just a matter of finding a brand that will suit your performance needs and budget.
Unfortunately you are probably looking at the price that you bought your Cordia Turbo for. After ECU unit cost, wiring looms, installation and dyno tuning.

Performance Chips?
A Cordia Turbo will benefit far more from a quality aftermarket ECU than any of the go fast chips available on the market.

Intercoolers?
Intercooling a Cordia will give you the advantage of being able to run a bit more boost. (more HP) But the extra piping will also increase spool up time for the turbo as well, and in certain models your aircon will have to go.
Intercooling is an area where you will have to spend a lot of time finding the best setup (front or top mount?, piping & core size?, water/air?, air/air?) to suit your Cordias performance and everday driving needs. It is not the cheapest or easiest performance mod on a Cordia. 
But a good intercooling setup can give you an excellent scope for increased performance on a Cordia Turbo. On the other hand a quick whack up intercooling  job can leave you with a car which is fairly poor to drive. 

Cutting the factory airbox?
I would not recommend cuting the factory airbox on a Cordia fitted with a factory ECU. For the questionable short term increase in performance, It will compromise an engines life span.

Aftermarket Air Filters?
Unfortunatley you cannot run a rampod style filter setup on a Cordia with a stock ecu and karman votex airflow meter. 
Many company's like K&N do make replacement airfilter elements for Cordia's. Just make sure that it is not an excessively oily style filter as it could damage your air flow sensor. 

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