the rs comes from greddy on the softest settings. you slowly tighten the screw to remove stalling or idle issues. you will get surge if it is too tight. stock turbo stock boost you shouldn't be full hard. the more boost you run the more you tighten the screw.
http://www.greddy.com/img/PHP/products/pdf/1274.pdf
http://www.greddy.com/img/PHP/products/pdf/1274.pdf