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The boost will be very low if you leave it stock, beacuse there is a pressure drop of a few psi across the intercooler. With this setup you might get more power on a hot day than before, but on colder days it would not be as different beacuse the actual boost would be lower. For example, stock you would be around 7psi (non intercooled) but with an intercooler it could drop to say 5psi, so you would be getting cooler air but at a lower pressure.
Once the boost controller is added you should stick with about 10psi at first. This will give a noticable HP gain and is in the safe zone.
Also with an intercooler the boost comes on slower (lag) due to the larger distance and volume from the turbo to the intake.
Personally I would wait to install the intercooler until you get a boost controller. The intercooler install is a bit of a project, and you have to run the lines also, so it makes it easier to do it all at once.
I can still remember the exact day (about 4 years ago) when I first installed the new turbo and and added an intercooler. The first test drive gives you a whole new appreciation for the car, and makes you wish you had installed it earlier.
Good luck,
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Zack Silver 83' 242Ti (221k)
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