Detroit, MI · In-House Dyno · Since 2013

If it made power, we can print it.

Every tune leaves with before/after dyno graphs in your hand — real, repeatable numbers from our in-house dyno, with insured work and emissions-legal calibration options stated up front.

Book a Dyno Slot Stage Packages
  • In-House Dyno
  • Printed Before/After Graphs
  • Insured Work
  • Emissions-Legal Options
Performance sports car staged in the shop before a dyno session
13 Years tuning in Detroit
4,100+ Dyno pulls logged
650+ Custom calibrations delivered
0 Tunes shipped without a graph
Services

From baseline pull to full build — with receipts.

ECU Tuning & Flash

Custom street calibrations via HP Tuners and COBB — datalogged, revised, and verified on the dyno. E85 and flex-fuel maps where the platform supports it.

Dyno Runs & Baselines

Three-pull baseline sessions with printed power and torque graphs, air/fuel traces included — know your real numbers before spending a dollar on parts.

Bolt-On Installs

Intakes, exhausts, downpipes, and intercoolers installed with torque specs documented — then tuned so the parts actually earn their keep.

Forced-Induction Builds

Turbo and supercharger packages built to a target number and a fuel plan — supporting mods first, dyno-verified, never “send it and hope”.

Suspension & Track Setup

Coilovers, sway bars, corner balancing, and alignment tailored to your tires and your track — street-compliant or full race spec.

Pre-Track Inspections

Brakes, fluids, wheel bearings, and safety gear checked against your sanctioning body’s tech sheet — pass tech at the gate, not luck.

How it works

Baseline. Build. Prove it.

  1. 1

    Baseline & plan

    Three baseline pulls, a health check, and a sit-down: target power, fuel choice, budget, and which route stays emissions-legal.

  2. 2

    Install & calibrate

    Parts installed with documented torque specs, then street and dyno datalogging until the map is safe, smooth, and repeatable.

  3. 3

    Verify & hand over

    Final pulls on the same dyno, printed before/after graphs, datalogs on a USB stick, and a 30-day re-flash window included.

Sports car cockpit ready for a calibration session at Apex
Why Apex

Numbers you can hold in your hand.

Apex opened in 2013 next to Eastern Market with one dyno and a rule the shop still runs on: nobody pays for horsepower they can’t see. Every tune ends with a printed before/after graph off our in-house dyno — same car, same day, same correction factor.

We’re insured for customer vehicles, we tell you plainly which calibrations are emissions-legal and which are off-road only (California customers: CARB-compliant parts only on street cars), and we hedge our numbers honestly — results vary by platform, fuel, and supporting mods, and we’ll show you the spread before you commit.

  • In-house dyno — tuned and verified under one roof
  • Printed before/after graphs with every calibration
  • Emissions-legal vs. off-road options stated in writing
  • Insured shop, ASE-certified techs, documented torque specs
Reviews

Built here. Proven here.

“Stage 2 on my Mustang GT: they quoted 40–55 whp depending on fuel, and the printed graphs showed +48 on 93 octane. First shop that ever under-promised me.”
Marcus D. Ferndale · 2019 Mustang GT
“My WRX came in with a sketchy mail-order tune pulling timing everywhere. Apex baselined it, showed me the logs, and rebuilt the map. Car is faster and finally boring to datalog — in the best way.”
Alyssa K. Royal Oak · 2020 WRX
“Pre-track inspection before my first Gingerman weekend found a failing wheel bearing that would have ended the day — or worse. Passed tech, ran every session, hooked forever.”
Dev P. Detroit · E46 track build
Questions

Asked before every dyno day.

How much is a dyno session?

A three-pull baseline with printed graphs and air/fuel traces is $150. Tuning sessions include unlimited pulls within your booked slot. Dyno-day group rates run $75 per car with a 10-car minimum.

What does a custom tune cost?

Most street calibrations run $500–$750 depending on platform and fuel options; flex-fuel and multi-map setups run $850–$1,100. All include dyno verification, datalogs, and a 30-day re-flash window.

How much power will a Stage 1 or 2 add?

Honest answer: it depends on platform and fuel. Typical turbo four-cylinders see 30–60 whp from Stage 1 on 93 octane; Stage 2 with a downpipe pushes further. We quote a hedged range up front and the dyno tells the truth at pickup — results vary.

Is tuning legal? Will it pass emissions?

We offer emissions-legal calibrations that keep all monitors and hardware intact, and we label anything off-road-only in writing before work starts. For California-registered vehicles we fit CARB-exempt (EO-numbered) parts only on street cars.

Will a tune hurt my warranty or my engine?

A calibration can affect a factory powertrain warranty — we say so plainly, not in fine print. As for the engine: our maps are datalogged and dyno-verified with conservative knock margins, and we won’t chase a number your fuel system can’t safely support.

Book your dyno slot.

Tell us the car, the mods, and the goal — we’ll reply with a slot, a hedged power estimate, and a straight answer on the emissions question.

(313) 555-0184 Mon–Fri 9am–7pm · Sat by appointment (dyno days) ASE-Certified · HP Tuners & COBB Protuner · Insured · Emissions-Legal Options Available