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Subaru updated the "cricket" TSB 09-54-12R on 12/10/18 to include '13-'19 BRZ. They put the most recent updated high pressure fuel pump starting with VIN J9603681. Part number for the newest high pressure pump is 16625JB022. Depending on Year/VIN at the most you would need the pump, drive case and a left side valve/rocker cover. There are no changes to the camshaft. I'm pretty sure you could bolt the newest pump up without any problems. The drive case and rocker cover changes are to help eliminate the noise. The following is a quote from the TSB.
"This bulletin provides a procedure to address customer concerns of a high-pitched “chirp”, “squeak” or “cricket” sound heard coming from the engine’s Direct Injection (DI) high-pressure fuel pump. Not all DI pumps may exhibit this sound. Some vehicles may have components which in combination with certain fuel temperatures and / or formulations, may result in aeration of the fuel within the body of the pump and cause this sound. This result is non-detrimental to the vehicle. Production changes have been made to eliminate the source of the sound."
It's just an annoying noise...
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