EGR - It is not used at idle or at WOT. You will get better mileage with it retained. If in CA you must keep it. Your intake manifold won't be polluted with exhaust gases and will stay cleaner with it deleted
BBV - Boost bypass valve. When open the supercharger is bypassed. The PCM will control the solenoid and turn it on and off as the PCM needs it. You will get better mileage with it retained. Some say you will get better acceleration with it deleted. Others disagree. If you delete it you want to block the valve shut, not open. The lever needs to be either all the way forward horizontal or rear horizontal for it to be shut.
MAP - To clean up the top of the engine you can move the MAP sensor to the top of the transmission. It MUST be connected to the Lower Intake Manifold (LIM) vacuum/boost port located under the supercharger snout. Then the MAP sensor electrical connector needs to be also move to the transmission.
Evap Purge Solenoid. - I recommend on keeping it. Move it to the top of the transmission also. A vacuum line needs to run from one of the vacuum ports between the SC and throttle body. (not LIM) The other vacuum connection of the solenoid then runs to the PURGE port of your stock Fiero charcoal canister. Of course it also needs it's electrical connection.
Lower Intake Manfiold Boost/Vacuum - Needs to be connected to the MAP, the Fuel Pressure Regulator and the solenoid of the Boost Bypass Valve if used.
SC to Throttle Body Vacuum (vacuum only, no boost) is used on the top of the BBV, the evap purge solenoid (if used) and the Power Brake Booster (vacuum line in the middle of the firewall running through the center console to the brake booster up front.
[This message has been edited by phonedawgz (edited 12-16-2013).]