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Old 01-18-2013, 08:15 AM
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Originally Posted by vitchie View Post
There is defnitely a difference in compression ratio. The 328 is 10:1 and the 320 is 11:1. Thus, the higher compression 320 will knock a lot sooner than the 328, so less tunable. I've also heard that the 320 has thinner drive shafts.
Where did you get your info on the compression ratio? (i know, not the best source of info) lists it as 10:1 -

The 320i gets different part numbers for the rear half shafts, but it doesn't look like the 328 shares half shafts with the 335i either. So you could say the 328i shafts are thinner then the 335i. I have no idea if that is true or not, but you see my point.

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