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  1. DIY: Do It Yourself
    Before we get started, there are plenty of stock-sized batteries the will fit nicely in the E46 with no modification to the hold-down bracket. This won't be helpful in that case. I just so happened to have a reasonably new Optima Red-top 34R (Group 34 with terminals reversed) from my Audi, and...
  2. E46 General
    I've been searching for a while now and though people recommend an Optima battery they don't say which model. I know that it needs a vent/vent tube, but can anyone give me a more definite answer?
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