wow, your car sounds pretty pimp. get some of this stuff, then go to a show and win some cash. with 12 psi i'm guessing you should get somewhere between mid-low 14's (all of that bling-bling stuff weighs a lot) and maybe mid 13's with race gas and 18 psi. if you don't already, get a data logger and a digital a/f gauge for real tuning. the blinky autometer gauge is fun to have, but you really need to go digital (doesn't mean you need to get rid of all the pretty LED's) to really get your car well tuned. get a vortech s-fmu too, people have been having issues with the standard hahn billet craptech fpr recently. oh yeah, almost forgot. make sure you get your ignition installed long before you go to race gas, just to be safe. the afc can totally screw with your timing as you incrementally go up in boost, resulting in what happened to Dave_FL... yeah... hmmmm, i dunno if you'll take this advice or not, but...

weight reduction.

i used to have a body kit, an inverter, a 1000 watt amp, 2 12" subs, a fog machine (dead serious) and a lot of other insane stuff but it drew way too much attention and the body kit bottomed out on everything in massachusetts. besides, the local hooligans who broke into my car a few months ago thought most of that stuff was neat. i just did the 97-99 eclipse bumper conversion with new headlights, and i think it looks better than my blitz ever did. the only bling stuff i have now are my non-chrome primax 10 spoke 17" rims and i have the rfl bov too. oh yeah, and the cheesy chrome tip that comes with the flowmaster muffler too. anyways, home that helps. i'm done now.

2016 WRX STi Limited (current)
2001 A4 1.8tqms (donated)
1991 GVR4 #1933 (sold)
old.dsmregistry.com/detail.php?carid=218 (dismantled)