You can get ground wire kits from various places (try eBay or other online stores). Some people would suggest just getting some wire and making your own, as it seems to be cheaper.
About the ECU upgrade, I think the only "real" one is the Powerchip upgrade. There was a big thread about it on the old EXD.
Found it....looks gppd waiting for the data sheet from the company only thing though I have to run 93 octane...and with gas proces here in L.A.....but I'm gonna shop around for a ground wire kit....a few people I talked to say it not a bad investment either...probaly get new plug wires and plus too. oke:
I have an ebay kit and I'm quite happy with it. I average about 2500 miles a month and my el-cheapo ebay ground wire kit has kept up pretty well (connectors haven't faded, wires still look good).
You can buy all the wire and connectors you need for under $20 and make a grounding kit yourself. I just did a DIY on making a ground buss for the EGT Club site, but it's not posted yet. If you want to see pics, I can put some up on Webshots.
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