Stock Audi RS3 idling in a dim garage bay, factory exhaust, OEM turbo
Stock · 302 hp
Boost0.8 bar
Torque380 lb-ft
0–604.6 sec
Tuned Audi RS3 on coilovers post-build, downpipe exhaust, hybrid turbo screaming
Stage 2+ · 520 hp
Boost1.8 bar
Torque590 lb-ft
0–603.4 sec

Same Four Rings.

Different Animal.

Audi Performance Specialists · ECU · Turbo · Carbon

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ECU Flash+180 hp
Hybrid Turbo+240 hp
Downpipe+45 hp
Intercooler+30 hp
Stage 2+ RS3520 hp
Stage 1 S4410 hp
0–60 RS3 S2+3.4 sec
R8 V10 Stage 1620 hp
Carbon Intake+18 hp
Coilover Kit-35mm drop
ECU Flash+180 hp
Hybrid Turbo+240 hp
Downpipe+45 hp
Intercooler+30 hp
Stage 2+ RS3520 hp
Stage 1 S4410 hp
0–60 RS3 S2+3.4 sec
R8 V10 Stage 1620 hp
Carbon Intake+18 hp
Coilover Kit-35mm drop
BOOST_DIAGNOSTIC_v4.2.1
01 / Diagnostic

Every build starts with the truth.

We plug in before we quote. A full OBD-II diagnostic scan reads your current ECU map, boost targets, fuel trims, and ignition timing. You see exactly what your car is making — and exactly how much it's leaving on the table.

302hp
Stock RS3
520hp
Stage 2+ RS3
3.4sec
0–60 S2+
Book a Dyno Baseline — $149

Credited toward any build package. Results in 24 hours.

02 / Build Stages

Choose your level of commitment.

Every figure is dyno-verified on our Mustang Dynamometer. No estimated numbers. No marketing math. Just receipts.

Stage 2

Downpipe-out hardware. The sweet spot for daily+weekend.

$2,890
Parts + Install + Tune
Peak Power
302 hp470 hp
Peak Torque
380 lb-ft520 lb-ft
0–60 mph
4.6 sec3.7 sec
Configure Stage 2
What's Included
Stage 1 ECU remap included
High-flow catted downpipe
Upgraded intercooler (bar-and-plate)
Forge motorsport DV kit
Boost raised to 1.6 bar
Cold-side charge pipe upgrade
Verified Dyno Sheet

Every Stage 2 package includes a before-and-after dyno sheet. Your car on our Mustang MD-1100. Real numbers, real conditions.

Boost Pressure
Stock0.82 bar
Stage 21.6 bar
03 / Dyno Room

The power curve doesn't lie.

RS3 8Y · DAZA · Mustang MD-1100 Dynamometer
Stock
Stage 2+
60045030015002k3k4k5k6k7k
Verified · Feb 2026 · SAE CorrectedBoost Performance Inc.

Our Mustang MD-1100 all-wheel dynamometer captures every run in SAE-corrected conditions. You get the printout. You see the before. You see the after. The numbers are yours to keep.

Stock
302hp
380 lb-ft torque
Stage 2+
302hp
380 lb-ft torque
+0 hp
Verified gain · 0% increase
+0 lb-ft
Torque gain · all-wheel pull
Tuned Audi RS3 on a mountain road at dusk, drone footage pulling back to reveal alpine landscape
04 / The Finished Build

The road is different
when you make 520 horsepower.

Every build leaves our shop with a dyno sheet, a full road test, and a follow-up tune after 500 miles. We don't hand you keys and disappear. We're in the passenger seat until you're satisfied.

05 / Client Builds

Receipts, not promises.

"

Took my RS3 in stock. Left with 520 hp and a smile I couldn't wipe off for a week. The dyno sheet is framed in my garage.

Marcus Webb portrait
Marcus Webb
RS3 8Y Owner · Stage 2+
"

S4 remap before the warranty expired. Boost's Stage 1 is invisible to the dealership and adds 120 hp. Best $899 I've ever spent.

Jordan Calloway portrait
Jordan Calloway
S4 B9 Owner · Stage 1
"

R8 V10 Stage 1. 620 hp on pump gas. It already embarrassed Ferraris — now it's embarrassing hypercars. Boost knows Audi.

Tyler Okonkwo portrait
Tyler Okonkwo
R8 V10 Plus Owner · Stage 1
RS3 Stage 2+ Build
520 hp · 3.4 sec 0–60