bmc is the company, cda stands for 'carbon dynamic airbox' - an inline cold air intake.
steel or alu; i would let the engineer advise as to the most suitable material.
re. gauges, plx has a multigauge that can display data in various formats - obd info from the computer, or specific sensor data (can mount in a 987 pod on the dash or a steering wheel pod). if you want oil temp, your stereo has the ability to display that. if you install an oil pressure sender on your motor and run the wire forward, a 996 gauge cluster will give volts and oil pressure.
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