parimus,
i dun think the nut came from the interior, the one you shown in the photo looks alike a heavy duty/anti vibration nut..maybe from your front lip
i checked already...yeah...it's exactly the type of nut from the exhaust manifold but all of the nuts are still intact...i wonder where it is from......anyway thanks bro hattech-v, that's very helpful of you...
ENGINE-S13 SR20DET
MOD ON ENGINE-
ENGLE FORCE CONROD
TOMEI 1.5 METAL HEAD GASKET
SUPERTECH VALVE SEAL
ACL CONROD & CRANK BEARING
WALBRO 255L FUEL PUMP
TOMEI ROCKER ARM STOPPER
ARP HEAD & MAIN STUD KITS
BRIAN CROWER...
the price is RM 600 plus the bulb is H4, the controller is RM 500. this item is brand new, it is good for those engine in the front, it cool down the engine by 20%