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There are two versions of the shark injector for the e46. One regular, and one with antiknock software. I have a Borla Cat Back and a dinan cai installed on my 2001 BMW 330Ci. Can someone please explain what the antiknock software does? Thanks.
 

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Anti-knock sensors retard the timing when the car starts to knock. This can be caused by low octane/impure fuel and/or hot weather. Since the shark tune is designed to take advantage of high octane fuel, i'd guess the anti-knock version takes into account the cars knock sensors readings and retards the timing if things get bad. Since your from Cali i'd probably go with the anti-knock one.
 
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