The rollers cost $40,000. The numbers cost about $30. Here's the pipeline working shops and tuners actually use — and how Shop Manager Lite turns it into printed dyno sheets and diagnostic calls.
| Tool | Cost | What you get |
|---|---|---|
| OBD dongle + Torque + Virtual Dyno | ≈ $30 | Full HP/TQ curve, before/after gains, printable sheets |
| GPS performance box (Dragy, RaceBox) | ≈ $150–200 | Real 0–60, 60–130, ⅛ & ¼-mile + trap speed — logged on the job, trap speed gives an instant HP estimate |
| Rented dyno time | by the hour | The real thing — for final tuning numbers and bragging rights |
Shop Manager Lite ships with stock horsepower and torque for 140 popular engines (plus the NHTSA record when you decode a VIN). Log a measured pull and it compares against the expected wheel-HP band for that drivetrain: Healthy, Down on power, or Needs diagnosis — with a checklist of the usual suspects, from a lazy MAF to a clogged cat.
That's the part customers respond to. "Your car should be putting down 215–235 and it's making 180" isn't upselling — it's evidence. And when the fix lands, the before/after curve is the receipt.
Dyno Lab, health checks, street numbers, invoices and the whole shop day — bought once, runs offline, data stays yours.