How does CBYX affect college admissions?

I am planning to do the Congress-Bundestag Youth Exchange my sophomore year of high school. Can any CBYX alumni tell me how it affected your college admissions? Did you or anyone you know get into a top college? How did your high school feel about you being gone for a year? What was your GPA for the year that you were gone? How were your grades transferred from Germany back to your home high school?