Took the L to Danny Swanson in Torrence CA, last month (birthday present to self) and he installed the PSP 4# lower, new plugs and his chip. Strapped her to the dyno and voila!
Since I live in the deep desert we kept the A/F very safe. (I'll look for the graph and post the #s)
Danny runs a clean shop and has been tuning Fords for years. A real pro - likes what he does.

So - I LOVE the increased boost, the tires are wearing out much faster now

 

If you don't mind me asking how much did all that run you? I've been thinking about planning a trip out to cali to visit some friends and maybe just happening to wind up at his shop somehow

 

I bought the pulley from PSP, and the chip, plugs and pulley from him. he changed the plugs and installed the pulley, too.
The chip and dyno was around 400 --all together about 880 excluding the pulley.