1-7/8 vs. 2-Inch Long-Tube Headers: Why Bigger Isn’t Always Better
Choosing 1-7/8 vs. 2-inch long-tube headers? Learn how primary diameter, collector design, cam timing, boost and RPM shape real-world power.
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150 Years Later, Stanadyne Is Still Chasing More Fuel: What the RGX Means for High-Horsepower GM LTx Builds
PRI recently spotlighted Stanadyne's 150-year anniversary. We look at what the company's modern RGX 12mm high-pressure GDI pump means for boosted and E85 GM LTx builds, why high-side capacity is only one piece of the fuel system, and how to validate the combination on the dyno.Read now -
Why Your Dyno Number Changed: SAE vs. STD, Weather, Gear Choice and Hub vs. Roller Testing
A higher or lower dyno number does not automatically mean a car gained or lost power. Learn how correction factor, weather, heat soak, gear choice, test procedure and hub-versus-roller hardware change the result, and how to compare performance honestly.Read now -
Your New Performance Car May Be Locked: ECU Unlocks, Credits and the Real Tuning Process
Read nowModern performance cars may require ECU or TCM unlocks, gateway cables and licensing credits before calibration can begin. Learn how to identify the correct access path, budget the full tuning process and avoid buying hardware that cannot communicate with your vehicle.
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Can You Drive It Without a Tune? The Expensive Truth About Headers, Intakes, E85 and Pulley Upgrades
Some bolt-ons are safe to install and enjoy. Others can create lean fueling, knock, misfires or unnecessary risk before the first hard pull. Learn what actually needs tuning—and what usually doesn’t.Read now -
Fuel Injector Sizing Guide: How to Choose the Right Injectors for Gasoline, E85 and Boost
Learn how to size fuel injectors for gasoline, E85, boosted engines and high-horsepower builds. This technical guide explains injector flow rate, BSFC, duty cycle, fuel pressure, cc/min versus lb/hr, injector headroom and complete fuel-system support.Read now
