Automobile · Performance Tuning & Dyno

DynoSource Performance

20009 W State Line Rd, Antioch, Illinois, 60002

Google Maps Updated: 19 May 2026
Authenticity Score: 75/100
About

DynoSource Performance is a polarizing shop. Many customers swear by Harold's expertise and tuning capabilities, noting significant performance gains and professional service. However, there are several intense negative reviews alleging poor communication, rude behavior, and issues with billing or repair quality. It seems to be a shop where you either have a great experience or a very frustrating one.

Our Review Process
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Most Relevant
19
Newest
20
Highest rating
13
Lowest rating

We analyze 72 public reviews for DynoSource Performance using our data models and filter out spam to highlight only authentic feedback.

Performance Scores
Service Quality 75/100
Transparency 50/100
Pro Tip

Always insist on a written quote before starting any major work, and clarify all potential costs upfront to avoid surprises.

Dyno Tuning
Performance Builds
Pros & Cons

✓ What Works Well

  • Expert dyno tuning
  • Significant performance gains
  • Knowledgeable owner

✗ Areas to Improve

  • Poor customer service and communication
  • Billing disputes
  • Inconsistent repair quality
Frequently Asked Questions
  • Do you tune my specific vehicle model?
  • Can I get a written quote for the build?
  • What is your turnaround time?
User Feedback

Harold is the best tuner around.

Communication is lacking.

Great results, but be careful with billing.