There's a large metal vacuum line that comes out of the center front area of the intake manifold. It eventually goes to the brake booster, and if you follow it from the intake when you get towards the front of the engine you'll see a coupling. That's where I opened up my system, and I found a piece of clear tubing that inserted snugly into the end of the vacuum line, thereby leading directly to the intake.
That done, I started the car, then inserted to hose into the BG-44k-it sucked ithe whole can in in about 3-4 seconds...very quickly. Since you're supposed to shut off the car just as you finish administering the 44K, I'd suggest you enlist the aid of a friend to man the ignition switch.
"If everything seems under control, you're simply not going fast enough" --Mario Andretti
1995 E500 street car
1986 Porsche 944 Turbo S track car