got them a while back in one of the cars i bought , could never find any info on them. part numbers didnt pull up anything

 

That second part looks like a MAF adapter for a later model Impreza/Legacy/Forester

 

The lettering in the HKS casting looks off in the first part. Sub-final production quality.
Second tube has a part number of ABCDEF 123456. That would indicate it is their 88,888,320th product that HKS has designed and produced.

More likely, these are proof parts from a company making counterfeit HKS parts.

 

well thats interesting lol. the guy i go tthem from had an FD and FC's and i got them included with a motor i bought from him.