Here is my $.02 for what it's worth; I have my own dyno, 605ci street hemi, through open headers and collectors it made 853hp and 818ftlbs. Back to back pulls 15 minutes apart, engine and oil at same temps. With the full exhaust hooked up,(3-1/2" pipes, X-pipe and 3-1/2" Ultra-Flows that dump right after the mufflers. It made 117hp and 97ftbls. LESS.Dave
