BOXERBuild Your
Engine Package
Stock EJ257.
237 wheel horsepower.
This is where every build starts. The curve plateaus at 5,200 RPM. Torque falls off a cliff past 4,800. The boost controller is hunting. You feel it every time you merge.
Parts go on.
Numbers go up.
Turbo-Back Exhaust
Cobb SF Intake + Tomei Expreme Ti. Charge temps drop 8°F. Exhaust flow up 34%.
Front Mount Intercooler
Perrin 600x300 core. Charge temps now within 8°F of ambient. Boost holds flat.
ID1050x Injectors
Fuel system headroom unlocked. Now safe to push boost past 18 psi.
Garrett GTX3076R
Ball bearing CHRA. Full boost by 3,200 RPM. Curve climbs to 7,200.
Full Custom ECU Map
12 dyno pulls. Boost curve razor-flat. Knock-safe 93 oct. 412 whp on the Mustang.
Cars we've built.
Numbers that don't lie.
"Boxer built my car twice — once when I blew the stock turbo, and once when I decided to actually do it right. 398 whp on a stock block. Daily driver."
"Gridlife MIDSOUTH T3 class. Boxer did the tune on E85. 441 whp. Car pulls to 7,400 like it's angry."
Start with the truth.
We'll show you what's possible.
Send us your year, model, and current mod list. We'll schedule your baseline pull and send back a written build plan with target numbers and itemized pricing within 24 hours.