Ok, new info. Got a Ford tech brochure from Prochargers..Here's the hype...Stage II Intercooled system with D-1 12 rib, operates at 15-25 pounds boost, 85%+ gain over carbed engine $4500.00. The last 347 I ran dynoed at 354hp at the wheels. If there claims are true, it would have 654 hp with the blower. Is my math wrong or have I been missing out on some very cost effective horsepower????