The SCV (if yours has one, which is likely) sits on the top of the pump, at about 1 o'clock as you look at it from the front. It has a black electrical connector on it.
I wouldn't suspect the SCV for smoke straight away, as Manning says. I'd look at air filter, MAFS clean (it's in the air intake, unlike the YD25, yours is part of the air tube itself just outside the air filter). You MUST be careful with this. Do NOT EVER poke anything into the MAFS. You can spray it with electrical contact cleaner, but don't touch the innards, it's extremely sensitive (and expensive). If the MAFS is dirty, it will report the incoming air stream incorrectly to the ECU and the ECU will calculate fuel and boost incorrectly.
You could whack a Bluetooth OBD adapter (ELM327) in and watch your boost pressure. The V9X should easily produce 20psi of boost. If you're not getting that, and boost pressure doesn't rise fairly quickly when your engine revs climb, your turbocharger might be less responsive than it ought to be. This will probably be a bearing issue, and may show itself as a sloppy impeller/turbine shaft. This shaft shouldn't wobble, if yours does then your turbocharger may need replacing.
As Manning says, checking the air path is important. Also make sure your battery terminals are nice and clean as erratic electrical connections can cause problems which might result in commands to the turbocharger or fuel system not being as accurate as they ought to be.
