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dinan is the only way to go!
i have a e46 m3 as well as my friend and we both upgraded the software at the same time he got the shark injector i got the dinan although shark advertises 9whp gain and dinen has 0 hp gain my m is much quicker than his now.Dinan tweeks your rev limits gives you better low and mid range response at the track i'm consistently 2-3 tenths of a second quicker than him quarter mile. you can find dinan at your local bmw dealer(not all dealers have dinan performance).also dinan doesn't void your factory warranty.Even though you have a 330 i hope this was helpfull.
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