Ecotec Exhaust & Airflow

Why does exhaust valve shape affect airflow? Learn how tulip shape, back-cut, margin, stem design and transitions influence Ecotec exhaust flow—and why two valves with similar diameters can perform differently...

21-4N vs Inconel vs OEM Ecotec Exhaust Valves: Which Material Should You Run? Is Inconel automatically the best material for an Ecotec exhaust valve? No. Inconel is an exceptional high-temperature...

Two Ecotec engines. Same cams. Same cylinder head. Same exhaust system. Different headers. One makes more power. The other doesn’t. Why? The answer lies in scavenging, exhaust velocity, collector design,...

Can a true long tube header fit a Chevrolet Cavalier or Pontiac Sunfire? The answer surprises many Ecotec enthusiasts. From engine mount positioning and tunnel clearance to thermostat housing modifications,...