I've worked on the 911 in the past, and the neighbors were cool and would stop by to see what I was doing.
They were kinda

at seeing the engine/transmission out but were like

.
It was a week at most then came the tuning part, I did it during the day when most were at work and it was pretty loud.
I have been asked to come help neighbors with their cars and actually helped this lady who is on the HOA board with her Jeep. Wouldn't start in P but it turned over in N. Turned out to be the shifter sensor. She kept saying wow... dealer would have made her bought a new tranny.
I do cap one side in the AM's and leave gingerly..
I've yet to do a Seafoam treatment.