If you have a knowledgeable tuner, you can have your motor start up with no idle speed valve. It will all be done based on the cold start map and you will just use the throttle body screw to keep it open just a little. The later throttle bodies don't have this screw BUT you can add it simply...
It is used for when the car has been sitting and the fuel in the fuel rail starts to boil, the VSV increases fuel pressure on hot starts. If it runs fine, don't worry about it, just loop the lines BUT if you can replace the plug, you should.
You can't beat ID1000 injectors. Those little things flow some serious CC of fuel and even crazier, Injector Dynamics themselves recommend you to run the highest fuel pressure your system can support but not past 100PSI as they atomize the fuel better.
The one seen here can work well at the rear of the rail but choose what is best for your setup.
http://www.jegs.com/i/JEGS-Performance-Products/555/110040/10002/-1?parentProductId=757777
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