The stock PN 2095501 is best; that is 0.5-0.6 ohms cold; I find them on eBay. Next best is the MSD 0.8 ohms cold that you can get a lot of places. 3rd best is the BWD RU19 at about 1 ohm cold, that is at many box stores. I would not bother with anything else except for an emergency.