They were ok for their time. Back around 2001 when I had the mild 383 in my Dart it had run 12.49 @ 109 with the old Torker. I put the Performer RPM on later and it ran 12.31 @ 110. The RPM was just much better in the 60 ft and 1/8 mile but for how old the Torker is it is not that bad. I believe in a intake test by Mopar Muscle about 10 or so years back the old Torker actually pulled more torque then any other intake they tested on a 440. Not the best hp as a few were better in hp but it had the top torque #. Ron