Engine and transmission mounts
Driveshaft
Intercooler and piping
Downpipe and exhaust
Radiator to engine block upper and lower coolant hoses
6cyl tachometer if you aren't able to adjust OEM tach
Check the condition of the timing belt, water pump, and spark plugs.
Check the coilpacks for any insulator cracks.
Upgrade the clutch if you intend to drive it hard.
Consider buying bigger brakes and a wideband sensor.
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