I reckon for 13s, you really need to reduce the weight of the car. Also, destroking to raise the revvability to 8000rpm without damaging the liners is a must. Once destroked to a k23, you can use K20a intake runners, a bored throttle body and K20A cams. Heck, since you are already destroking, just put on a K20A head to defeat the electronic throttle. Once that is done, you won't have A/C and instruments, so pull the dashboard out to fit in a lightweight instrument panel. Pull out all the sound deadening too.
I don't think you'll get the weight of the Euro down that much. Because it is only about 1400kg but yet the body is stiffer than a heavier E46 3-series. That means there is a large portion of that 1400kg in the chassis, and that cannot be removed easily.
Oh, and go aluminium bonnet and boot!
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