A Buddy Of Mine Has A Supercharged 4.6 2000 Roush With A Vortech Blower Pushing About 11 Pounds Of Boost. He Also Has 42lb Injectors With A Sct Programer. The Exhaust Is Mac Long Tubes With A Pro-chamber And Two Flowmasters Dumped In Front Of The Rear Axle. I Think Its A Back Pressure Problem Cause He Dynoed And Tested It For Two Days Messing Around With The Rich Lean Bull. And The Car Is Stuttering And Popping And Killing His Performace. Please Help Us Out!!!