Such as? Links? A tune is usually one of the first things I do to a new (to me) car. While factory tunes on newer vehicles have gotten quite good on modern cars with full widebands stock etc., the OE still has to make compromises that aren't always ideal for best running conditions. Doesn't help, I suppose, that my best friend is one of the best BMW tuners in the country, and a majority of the past god knows how many cars I've had have been BMW's.... That, and I'm just not a fan of 'fixes' that fool the ECU. Garbage in, garbage out is never a good way to go, so if there's a way to fix the issue in the software itself, thats always better.