Turbonetics T3/T4 $60, FMIC $45, and IC piping $20 from a Civic @ U-Pull-it junkyard, Tial Waste Gate and no name ram horn $75 Craigslist, Unknown BOV and Boost controller $35 Ebay, Apexi AFVC2 $75 from a guy that needed money BAD at sonic!
$310 for 12psi, now that is a bang for you buck!
Other than having to weld the manifold a couple of time I have never had any problems.
I got really lucky finding that car in the junkyard. I have a buddy that works there and he told me when they were putting it on the lot! I was there before they opened that day to make sure I got it!
The biggest performance gain I found was when I put in an 8lb flywheel while changing my clutch. HUGE difference at takeoff, but you lose fuel economy at highway speeds (although you gain it at low speed).
For me, it was my NGK Iridium spark plugs and NGK wires in which I consider the best bang for my buck. Now, I am sure there are plenty other companies out there that I could have went with, yet for my budget and for ease of purchase, I am satisfied.