To do a p&p job you will have to remove the valves from the head. You can really get into it and remove alot of metal which you have to be careful with or you can just do a good clean and smooth it out job. You will find the exhaust ports to be lined with carbon and the intake ports lined with residue from the pcv. Actually the whole intake will be coated from the pcv. There are videos on youtube of p&p ing but most of them are on big v8s that have much bigger ports. On the 7m the ports are much smaller and harder to work on. On mine I tried to do it myself and got sick of it and had the guy at the machine shop do it for me. He spent about 4 hours grinding away as well as a valve job and reshiming for $500.
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