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Well.
Any factory turbo car will benefit the most, as far as gaining power with the stock setup goes, from a less restrictive intake and exhaust, so something like the K&N filter kit, a downpipe and a catback would give you quite the bump in power.
Boost controller should come after those mods, as it's pointless to throw more boost at the car when the intake and exhaust are both still restrictive.
A turbo manifold is kinda pointless for that motor, especially if you're going to keep the stock turbo for now. Maybe if you just want a "blinged out" version of the manifold to show your friends or something.
Turbo timers are the biggest waste of money, and again, pretty much for the people that are looking for attention of getting out of the car and locking it, then walking away, for others to be like "hey your car's still on". What you can do is just to sit there and wait like maybe 10 seconds after you get to your destination, then shut it off. Your stock turbo is water cooled I'm pretty sure, which means it's not going to have issues like some of the non water cooled turbos will have.
Even if it's non water cooled, you don't sit there for like 5 minutes for your turbo to cool down, maybe like a minute, so just get to your destination, gather your stuff, chill out and listen to the radio for a second or whatever, then shut your car down and get out.
As for the blow off valve, the Evo comes with a pretty decent one from the factory, so unless you want attention/bling factor, there really is no real hurry to get a new one. Shoot, you can buy the 1g DSM (first gen DSM) ones for less than $50, and those are made with metal, and you can "crush" them and they'll hold like over 20psi, so...
That should give you an idea of what to buy in terms of the order to buy them in.
As for brand, go for something that's in your price range, and that there'll be warranty on.
Personally, I'd look into either GReddy or Apex'i exhaust, maybe even JIC, and K&N intake filter. If you must get a non DSM BOV, then I'd recommend either the GReddy Type-R or the HKS SQV... the Blitz hates partial throttle from what I've personally witnessed (happened to friends).
With electronics like boost controllers or gauges, I'd go with either HKS or Apex'i. GReddy electronics suck, and Blitz seem to be over priced, but works well.
Of course there are American companies making the same things too, but I'd only really trust AEM's electronics.
Do some research, look around, sign up on EvoM.net's forum and learn about the car and what people put on them.
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2.0L Plus Crew - Member # 4
18.67 @ 69 mph in the 1/4 mile
Rocking da 17x7 +40 chrome Eagle Alloys
245/55/17 for da slip anglez and uber gripz
+66mm ride height for da grip like ridin' on railz
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