What AEM_Inc just posted is all good! but why build somin if u don't have to!
Honestly ... if u are after HP don't even bother with the SR. u might want to look at the RB swap.
For about 3500 (maybe less) u can get a RB25det front clip.
Now u have 6500 left to play with ... HKS Manifold & HKS 3037 run u about 2500 .... u have 4 grand left enuff to buy you intercooler kit ... custom 3" exhaust (turbo --> back) upgrade injectors,ecu and all the little stuff that goes along with it. That should be in the ball park of 10 grand!
With this setup u'll be in the 11-12's without a doubt!
I know a shop in michigan that has a rb25det front clip and a rb26dett in stock sitting in thier warehouse. They also have 3 s13 red tops and 3 s13 blacktop front clips there also sitting on the racks.
www.autowerksmotorsport.com email then see what they can do for you.