I also have the Wynjammer S/C.
The "selling points" for me was, easy install, runs with stock motor and good price.
After a couple of weeks of installation the fins on the blower all sheered off from a bad bearing.
I called Al, he said to send it back (un-installing was 15 minutes or less!!),
Al repaired it, ran it for several days and made sure it was 100%, he sent it back and paid for shipping.
From what I understand, there was only 2 out of the 1,000's sold that went bad (very good record, IMO).
Bottom line, Wynjammer stands behind their products, you can speak personally to the owner and designer and he makes his product good "if" it goes bad.
Even with the defective S/C (always me!!!), I would still recommend it.
There are probably stronger S/C's out there, but none so easy to install and very little to keep it maintained
6 lbs. of pressure is not a "lot", but it sure beats stock!!
Not wanting to build the internals, this worked out great for me.
I am not going to have the fastest truck on the road, but it sure makes a difference over stock with the S/C, E-Fan, exhaust and a few other "bolt-on's"
If you are looking for more power, a company that stands behind his products and is accessable, very reasonable price, this is it