need help identifying :S

[eebhu]

hello, need help identifying this one. found it while i was trying to DIY connecting my pivot speed limit cutter to my ecu. my s15 is a jdm one. this is my 1st time tinkering with the ecu.

[/IMG]thanks in advance

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[S15 SILVIA]

Looks like it could be a piggy back ecu of some kind?!