My buddy just got back to me. He emailed the guy and he said they actually sell 3 kinds of Saturn Mods (Although they only list the 20 pin). When my friend asks about them here is what they told him.
20 Pin IC Chip: Used for older model system only.
21 Pin IC Chip (Plug-In): Cheap version for newer systems, however has many compatibility issues. Does not work on 64 pin style chip model.
21 Pin IC Chip (By-Pass): More expensive (pass through model). Works on all new machines (100% Compatible). No timing wire, so everything is built in (I guess they have the crystal and crap on it). Can order the needed ribbon cable seperate.
My friend said the store guy recommended the pass through model since it works on all new machines. The cheaper one only works on 32 pin style chips. He said some people try to short the timing wire to make it compatible, but this is not the correct âfunctionâ and may damage the IC (Whatever that means) so no store does this.
The last thing my friend mentioned is that the picture sample may not be the exact same as the IC, but all work the same as the model type you order.
So anyways, Kick ass! Time to get him to snag a 20 pin for me.