The r12s filter is perfect with the exception that is only flows 15gph the diameter is perfect for the mk3 fuel filter bracket and the 140r mount isn't too expensive. I just think I would be starving the pump at sustained WOT. http://www.parker.com/portal/site/PARKER/menuitem.de7b26ee6a659c147cf26710237ad1ca/?vgnextoid=fcc9b5bbec622110VgnVCM10000032a71dacRCRD&vgnextfmt=default&vgnextdiv=&vgnextcatid=2552&vgnextcat=140R%20FUEL%20FILTER/WATER%20SEPARATOR&Wtky=FILTERS