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Discussion Starter #1
with a 325ci step, which upgrade will I feel more? The Technik stage 1 adds about 10hp and is $800. A new Z4 diff costs 1k, but if i search hard enough maybe I can find a used one for much less. The Z4 diff is 3.64 and my car already has the 3.46 so I'm not sure if the better acceleration can be felt with only a 5% gearing reduction.
 

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Discussion Starter #2
anyone? I'm sure there are people that have done 1 or the either and can give their opinions...
 

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you can also offset the cost of your new diff. by selling the old one. a 3.46 wont last too long in the FS section, u wont have a problem :D
 

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Get both. Since youre in CA check out Lakenor Auto Salvage in Santa-Fe Springs. They usually have a few diffs. in stock. $450, sell your old one for $450 and use your money to buy the stage 1 kit
 
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