Hey guys, my car had a JDM FS-DE swapped in by the PO, and apparently that means it has a different intake cam and higher compression (9.7:1). At that compression, should I be running 87, 89, or 91 octane fuel with a stock USDM FS-DE ECU? Also, my knowledge of cams is limited, so if anyone can explain the differences and pros/cons between the JDM and USDM intake cams, that would be awesome