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You should not install an open air BOV on SAAB's latter than 1999. Rather you can install a forged aluminum version that still evacuates the boost into in the intake pipe just like the factory version.
The computer usually sits on the wall next to the driver's legs, but yours could be under the seats, or under the dash, that one I don't know, but it should be kept dry, not under the hood. The valve body is in the transmission. It is accessible from underneath, just under the filter, or on top I should say, holds all your shift solenoids etc.
HAVE THE SECONDARY AIR INJECTION SYSTEM CHECKED OUT.TO MAKE SURE ITS ELECTRIC MOTOR PUMP ASSEMBLY VACUUM VALVE SOLENOID COMBINATION AIR SHUT OFF CHECK VALVE AND TUBING IS INJECTING FRESH AIR TO EXHAUST MANIFOLD.CHECK IT FUSE AND RELAY.GLOW PLUG LIGHT.COULD MEAN A FAULTY GLOW PLUG FUSE OR RELAY PROBLEMS.
It is not wise to install a BOV on a 1.8t since it could cause problems with stalling in between shifts if it is vented to the atmosphere. The most recommended aftermarket solution is a new diverter valve (ex: Baileys, APR etc). If you still want to install the BOV they sell kits for the ssqv that mounts it to the charge pipe and routes the air back to the intake.
I've seen quotes in the $1500-2500 range, depending on what needs to be done and what the parts prices are. Regardless, when you do it you may want to upgrade or at least replace the diverter valve (DV) as well - they have a plastic diaphragm inside and are prone to failure. You can buy a new OEM one, an aftermarket one such as a Forge DV, or upgrade to an OEM DV from an Audi TT 225.
If you're in the northeast, I can help you out with this - I can change it out in my garage and I happen to have a pair of OEM K03 turbos from a 2001 S4 sitting on my shelf:) If you are in this area, leave me an email address where I can contact you and I can arrange to help you out (at a significantly lower cost than those shop prices quoted above).
A dump valve replaces the recirc valve. Did you see the reply to your prior post on this topic that I put up the other day? You can do it but it'll cost you your catalytic converter and O2 sensors - that has been proven out many times in the past. If you don't care about that and don't mind spending $1200-1500 every year or 18 months to replace those parts, then go to www.audiworld.com or www.audidiy.com and look in the tech areas - there are step by step procedures there that walk you through recirc valve replacment. They'll show you how to fit an aftermarket recirc valve, but you can follow that procedure to do a BOV as well.
Seriously though, as I said before, some cars are fine with BOVs but Audis are not. You're going to cost yourself a LOT of money just for the sneeze sound and slightly slower turbo spool. Your car and money though so it's your decision.