PSI understands the importance of a quality tune. A quality tune is a piece of mind. The fact the car will start, idle and be enjoyable to drive is sometimes forgotten in the quest for performance. PSI has a deep knowledge of tuning principles and with close to 35,000 dyno pulls in our library, we use real world data to ensure each client leaves with the best tune possible. PSI also has a strong familiarity with E-85 tuning and water/methanol injection.