I ended up making and installing mine today.
I used 4g JL Audio flex cable, found the ends in a hardware store and bought heat shrink at Harbor Freight.
I mounted 2 of them in different locations than the link above; the trans mount and the drivers strut plate.
Call me crazy but I can tell a few differences.
Just starting the car is completely different. Sound and feel.
I also noticed a somewhat different throttle feel. May have added some pep.
Overall, an easy DIY mod I would recommend. I'll report back after I drive a little more.
One thing I did do was dremmel the paint away on ALL the connections. Not just the one in the instructions.