These are my top two:
Good- Frybrid- everything you will need to get the car running perfectly on vegetable oil- the downside is its huge pricetag of $1500-$2000
Best- Greasecar- just about everything you will need to get the car running on veg. The Greasecar kit does not use a heated tank pickup, a flat plate heat exchanger, or aluminum fuel lines. The Greasecar kit is totally coolant based, which is not very good for the winter months. With the addition of a Vegtherm ($99 electric fuel line heater from Plantdrive.com) the system is nearly perfect. It is true that the PEX fuel lines do not transfer heat quite as well as aluminum, but it gets the job done fine. The filter is heated in both cases and both have a water separator. Both sets of switching valves are good, but the GC ones are better by a little. The Greasecar kit is $800 including shipping.

I'm biased because I did this research a year ago and chose the Greasecar kit. The biggest issue for me was cost, and the Greasecar kit plus the one electric heater make the Greasecar kit the best option. I've been running with the GC kit and Vegtherm since last spring without problem (with grease, the car had other issues...). One other thing is that the Frybrid kit is done with electronic switch over from diesel to veg. based on the temperature of the car. The GC kit is a manual switch flip (I mounted it, the fuel gauge, and temp. gauge in the ashtray). I prefer the manual method, but that's just me.

If I were to do this again I would definitely do it myself. I calculated that buying all the gadgets separately (including a flat plate heat exchanger and Vegtherm) would cost a little less than a GC kit.

Hopefully this helped a little!

__________________
Andrew

1989 Volvo 745- 202K