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Old 01-18-2013, 06:13 AM
vitchie vitchie is offline
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Location: South Africa
 
Join Date: Jan 2013
Posts: 22
Mein Auto: 2013 F30 328i
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.
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