44 is shown communicating with optional electronic throttle 62 which adjusts a position of throttle plate 64 to control air flow from intake boost chamber 46 compressor 162 draws air through air filter 82 and air intake 42 to supply boost chamber 46 exhaust gases spin turbine 164 which is coupled to compressor 162 via shaft 161 vacuum operated waste gate actuator 72 is supplied vacuum via wastegate vacuum reservoir 91 and it allows exhaust gases to bypass turbine 164 so that boost pressure can be controlled under varying engine operating conditions compressor bypass valve cbv 158 is vacuum operated via vacuum supplied by vacuum reservoir 138 boost pressure in boost chamber 46 may be reduced when compressor bypass valve 158 is opened since output of compressor 162 is fed back to the input of compressor 162 distributorless ignition system 88 provides an ignition spark to combustion chamber 30 via spark plug 92 in response to controller 12 universal exhaust gas oxygen uego sensor 126 is shown coupled to exhaust manifold 48 upstream of catalytic converter 70 alternatively a two state exhaust gas oxygen sensor may be substituted for uego sensor 126 engine exhaust gases are directed to converter 70 converter 70 can include multiple catalyst bricks in one example in another example multiple emission control devices each with multiple bricks can be used converter 70 can be a three way type catalyst in one example vacuum for the vehicle vacuum system is stored in vacuum reservoir 138 vacuum reservoir 138 is in pneumatic communication with other vacuum system components via passages as shown vacuum may be.