If it were bone stock then I would say keep the stock ECM. If you think you're going to spend some time tuning it, and the stock ECM is a 160 baud, then I would upgrade it, there is no reason not to. Tuning is much easier with a faster PCM. Such as, you can see transient conditions easier i.e. lean spikes or bogs, and BLM datapoints fill in much quicker with more samples. Also there are MANY more items to monitor in the datastream for troubleshooting and tuning.