This regulator bolts directly on to the srt4 billet rail or the Honda rails with the regulator on it It is a rising rate of 1:1 with boost pressure applied They are a Chinese knock off of the AEM that we re machine to accept an AEM aftermarket style diaphragm. This allows us to keep the price down while maintaining a reliable regulator 6orb to 6an fitting included for easy return line hook up Message for a spare diaphragm Message with the color that you want Black, blue, red, silver, grey, gold , purple Please allow for 1 week for shipping as these are made to order
