The USDm 2J come with high impedance 550cc's I believe and the Aristo one comes with 440cc's low impedence. if I'm correct all you need to do is buy the USDM Resistor pack from Driftmotion and you should be good to go with USDM 550's. hope this helped
-If you guys have any suggestions on injectors for a JDM 2j please correct me.
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