I am planning on getting my car tuned at agile and they said I need to get a GM Boost solenoid. Does anyone have a part # for this and know of any thread that shows how to install this part. They said this part works much better than the stock part. Any info on this subject? I have a tune session set for September 30th and want to make sure I have what I need. They do sell them and charge to install them, but I would like to save money where possible since the tune is $500.