Here's a place to go shopping: http://www.koalamotorsport.com/

While it's nice to improve the acceleration of your car, a higher ratio
differential will make it's presence known most often with higher engine RPM
at cruising speeds. It might not be particularly rewarding to cruise the
freeway at 4000 RPM.

R / John

"LPG systems" > wrote in message
...
> Can anyone tell me which differential is the best for my 733i 1977? I want
> the best acceleration, consumption and top speed are not important.
> Thanks
>
>