New LS1 Owners - Newbie Tech - starting the build on my 02 z28

I bought my best friends z28 from him over the winter and have yet to register the car because i go to school and wouldn't be able to drive it anyway. The car is a 2002 nbm a4 hardtop with 2.73s and came with a set 26 inch et streets on 07 vette wheels and a universal zex dry kit never installed just a bottle in the car for looks. It has 84,000 on it and the only performance mod on the car is a K&N fipk system. I bought a yank ss3600 from a member here and im about to buy bbk lts/ory, frame connectors, poly motor/trans mounts, and some bilsteins. Im just looking for some ideas of where to go next with the car. My goal is to beat my buddy with an 11.5 gt500 and im not afraid of the spray.

Underdrive Pulley,Dyno Tune,Suspension w/ the mods you already listed and the NOS should see low 11's as long as you car hooks !

Set of Longtubes, full exhaust or offroad ypipe into a nice back exhaust. Intake manifold I went with FAST 102mm intake manifold and fast 92mm throttle body, heads and cam, new fuel injectors. Definately need a stall converter. Yank SS3600 is a good Streetable stall. After a good tune you will be in the 400RWHp range