Yes, you get what you pay for. JDM stands for Japanese Domestic Market. It should mean that the product was designed and marketed for the Japanese market. JDM headunits (typical double din) have a different band for FM, not US, Japan compliant. Other things say JDM but who knows. I asked one vendor and they said it increases sales to put JDM on their items. Intake? AEM, INJEN, COMPTEC, anything that is CARB is good.