Re-hasing some of the processors discussed on the original NASIOC thread:
'02 2.0L Turbo ECU related
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D151851-3830 160 pin QFP
Suspected Motorola M68HC16 core, possibly MC68HC916 based on usage of the D151851-0710 in the FD3S RX-7 -- see this page. Translation here would be greatly appreciated.
MC68HC916 datasheet
CPU16 core Programmer's Guide
'04+ 2.5L Turbo ECU related - 2 processors
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Renesas 7055 (SH-2 processor) overview and links
Seen in '04 STi, all '04 2.5L?
Renesas 7058 (SH-2 processor) overview and links
Seen in '05 LGT, all '05 2.5L?
SH-2 processor datasheet
D151851-4410 132 pin BQFP
See above. No potential pin for pin equivalent ID'd.