you can make you own kit a lot cheaper with audio parts and wire from home depot..I did it and noticed a difference mostly in my idle..my car used to make my car shake when it idled..
$10 lets you roll your own. It won't really do much unless your car has grounding problems to begin with.
Agreed Moose, but it never hurts...helped mine a bit. Nt a lot, but started quicker and reved a tad smoother.
I'll sell you mine for $10 if you like... It was installed but kept grounding out. I have no idea whiy. It was installed *exactly* the same as 1ll-WRX and his worked fine but mine didn't. I think it has something to do with the battery monitor in the dash gauge pack. The kit itself it in pretty good condition. After all it's just thick wires and some bolts.