I just took a look under my hood and didn't see asnything like that either. I have two small black boxes on the other side near the brake fluid reservoir that look like they could be relays or small CPUs. I didn't check under the battery. Sounds like you have made some cool mods to your car. Do you have pics on the net anywhere? Let us know if you do get the chip and how it works out.

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Jason Priest
1999 E430
1995 E420 - retired
1986 420SEL - retired