I should add that both of my controllers (AMS and GReddy) taper the boost down to 20 psi in 1st and 2nd gear, but the GReddy will maintain 25 PSI in in 3rd through 5th, whereas the AMS manual will taper to 23-24 in the higher gears.

Also, do not be afraid of the tuning nightmares that you'll find when you do a search on the Profec. It is very simple to install and tune, even if you are just of moderate intelligence.