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2018–2023 Mustang GT · Naturally Aspirated

Stage 4 N/A

2018–2023 Mustang GT performance package — 600+ hp target.

Stage 4 of 5Naturally Aspirated14 parts on the sheet

The parts sheet

What’s in Stage 4 N/A.

18-23 Naturally Aspirated Stage 4 Package

RPG 5.5L N/A High Compression Built Shortblock
Frankenstein Ported Cylinder Heads
Upgraded Valve Springs
Comp Cams
Oil Pump Gears and Crank Sprocket
Primary Chain Tensioners/Guides
Frankenstein Billet Intake manifold or A Hi-ram style intake manifold
Throttle Body
OTR Intake
Built 10r80 W/Circle D Converter or Mantic Clutch for MT82 equipped Vehicles
Injector Dynamic Port Injectors
Bumbera's N/A Spec Dual Pump Fuel System
Full Exhaust System
Shoemaker Performance Tune/Speed Density Conversion

Installed in-house by the High Performance division
Baseline and final pull on our Mustang dyno — you get the sheet
Bumbera’s license plate frame & Bad Fast decal

← Previous stageStage 3 Twin Turbo · 1000 hp Next stage →Stage 4 Procharger · 1000+ hp

Horsepower target

600+ horsepower

Stock2,000 hp

Targets assume the listed parts on the listed fuel; your car, your mods and your fuel move the number. Prices are quoted per vehicle.

Get a quote for this stage Call (281) 493-9300

Every package includes

Install by the High Performance division
Before & after dyno pulls
Plate frame & Bad Fast decal
Off-road use only — disclaimer

Other 2018–2023 Mustang GT stages

2018–2023 Mustang GT · all naturally aspirated stages

Where it sits.

Naturally Aspirated

Stage 1 N/A

Cold Air Intake, Shoemaker Performance Tune

Naturally Aspirated

Stage 2 N/A

Cold Air Intake, Headers with Cats, E85, Shoemaker Performance Tune

Naturally Aspirated

Stage 3 N/A

Cold Air Intake, Headers with Cats, E85, Intake Manifold…

Naturally Aspirated

Stage 4 N/A

RPG 5.5L N/A High Compression Built Shortblock, Frankenstein Ported Cylinder Heads, Upgraded Valve Springs, Comp Cams…

Naturally Aspirated

Stage 5 N/A

RPG 5.5L N/A High Compression Built Shortblock, Frankenstein Ported Cylinder Heads, Upgraded Valve Springs, Upgraded Intake and Exhaust Valves…

Get a quote

Quote Stage 4 N/A for your 2018–2023 Mustang GT.

Tell us the year, current mods and fuel and a Performance Specialist will spec the package for your car — usually within a business day.