What should the guts of my sr20 ECU look like?

[dsilvia89]

Hey guys

I just got my nistune installed and when i got home i took the cover off to see my what the nistune looked like installed...

then i got curious how the stock ecu sitting in my silvia looked....

THE FOLLOWING PICTURES ARE MY S13 SR20DET REDTOP ECU:

http://i1027.photobucket.com/albums/y335/ffcjames/DSCF1803.jpg
http://i1027.photobucket.com/albums/y335/ffcjames/DSCF1804.jpg
http://i1027.photobucket.com/albums/y335/ffcjames/DSCF1806.jpg

the picture below is my stock redtop sr20det ecu, and the other is the same with a nistune installed.

Does anyone know what the varying "1X15" and "2527" mean??:confused:
http://i1027.photobucket.com/albums/y335/ffcjames/DSCF1807.jpg


Thanks in advance guys :bigok: