Make sure they preheat to the right temp and use the right filler rod or wire.
One vendor did it wrong and it had terrible results. I can't remember which..

If you want to see how many times and how long it'* been done successfully 'fake' or 'wrong' look to other forums. Not everything is here.

Got a chance to get started on quantifying my "fake" PEM this afternoon.
Testing is FAR from over, but after a few runs tuning the Volumetric Efficiency table, preliminary results indicate:

I think this is going to be $30 well spent, as well as a very good (perhaps, necessary) supporting mod for rockers and springs.

EDIT: when I finish my testing, I promise to stop hijacking this thread and start my own.

well if you get more than 5 hp that good .i can make a fake PEN lets say 1 hour at the most to take it off 2 hours to port it and take a break 1 hour to put it back on total cost 0$ and if its lowers KR well that a bonus .keep us posted and i will have a before and after track testing to see how much it gives

Interesting