lpg?

[notty]

does any1 know on how to go about converting a 320i straight 6 from unleaded to lpg and will i keep the same performance?

[Brianmoooore]

Plenty of us on here have done this, and can advise you.
There is a cheap and simple way of converting the engine which will in theory loose you a small amount of power, assuming your petrol system is giving you full power at the moment. If your 100,000 mile+? petrol system is past its best, you may actually gain power. Either way, the amount of power lost or gained isn't really noticeable.
Alternatively, you can fit a more complex LPG system, using individual vapour injectors, which shouldn't loose you any power at all.
I converted the red touring in my sig. to LPG in 2000, IIRC, and have covered around 100,000 miles with it since.

[jonny323i]

what kind of price would the first option be and how long would it take to install

[Brianmoooore]

With careful/lucky ebaying, plus a few new parts, it can be done for around £300. That's for a 'Leonardo' controlled mixer system.
It's all fairly simple DIY stuff, and can be done in several sessions, each of which doesn't take the car off of the road for more than a few hours.
For example, you could fit the tank and filler one day, the hardware under the bonnet the next, then all the pipework, and then the electrics.

[e301988325i]

Well worth doing if you live near a station with LPG, expect to save 40% of your fuel bills.