Fuel Injector Cleaning & Flow Testing

Your engine is only as good as its injectors.

Running rough, burning too much fuel, or down on power? Dirty injectors could be the problem. We clean, test, and restore your injectors to like-new condition — from high-performance race cars to boats and daily drivers.

  • Top-feed injectors
  • Digital flow bench testing
  • Spray, leak & resistance tests
  • New filters & Viton® O-rings
  • $65 + HST per injector
  • Gasoline / Ethanol / Methanol

Proven at the Track

Our injectors run in winning cars

Racers trust us with the sets that have to perform on race day — and they keep coming back.

Nico — 2025 Quebec Grudge War Champion, running injectors serviced by Underdog
Customer pass — back at the track after cleaning & flow matching
$65
Per injector + HST, plus shipping

One flat rate for the full 8-step service — and free pickup & delivery for Aurora, Newmarket & Vaughan customers.

$20
Fair Pricing Guarantee

If an injector cannot be serviced, we don’t charge full service fees — only a $20 test/flow check fee. You only pay full price for injectors we actually restore.

Get Started

Send your injectors with confidence

Whether you’re running a high-performance drag car, a boat, or just want your daily driver to run smoother — we’ll make sure your injectors are cleaned, tested, and ready to perform.

Coming soon — Mobile service