I've heard great reviews on the Brenspeed Detroit Rocker for our 4.6 motors. Apparently most of the other cams such as FRPP Hot Rods, Mutha Thumprs, etc. suffer some driveability in the lower RPM's, causing the car to "surge". My local shop told me the Detroit Rockers still give that lopey sound at idle, have excellent driveability and nice power gains comparable to the other cams on the market. There aren't many Youtube vidoes out there ot hear them in action. Just do you research and pick what meets your needs.