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I currently have:
Borla cat-back s-type classic exhaust
K&N cold air filter attached to vararam system (vararam filter was beyond shot from previous owner needed something asap)
Long tube headers with x-pipe
diablosport platinum 93 octane tune
I dont know which direction i should go next in terms of performance upgrades was just trying to get some pointers from some professionals. The car is an A4 with stock gear ratio 2.73, with the LS1 motor
What is your ultimate goal for the car? For a daily driver with a little more pep I would recommend a 3:42 Z06 differential. You can build up from there with heads and camshaft and/or forced induction.
Depending on your goals, if you plan to stay NA I would get a cam, intake, C5 manual trans 3 rib diff with 3.42 gears, a new torque converter, and A REAL TUNE (get rid of that diablo sport garbage).
If forced induction is in your future, well, how big is your wallet and how much power do you want to make?