best performace-oriented 500 bucks youll ever spend

i run **aaaalmost** nose to nose with my brothers 06 LS2 GTO. it'll start to walk away slowly in high 2nd to 3rd

2000 A6 2.7T 6-speed
APR 93 Octane Chip
ASP Stage 4 Feramic clutch w/ RS4 Pressure Plate
Fidanza Lightweight Aluminum Flywheel
ASP Street Density Trans Mounts
Hella Smoked Tail Lights
Blitz Digital Boost Gauge/Turbo Timer
Piggie Pipes
Custom Magnaflow 2.5” True-dual Exhaust
Short Shifter
Eibach Springs- 1.5” drop
PSK Rear Sway Bar
Pirelli P-Zero Nero Tires