The Gramma car was the test bed for the installation video of the new Pypes oversized manifolds and exhaust system. It definitely woke the car up. I can honestly say that the Gramma car will leave our '73 SD455 in the dust. I did a little comparison timed sprint of a local on-ramp. The SD455 would get to the end of the short ramp at 50 mph. Gramma hit the same spot at 70 mph.
angry engine sound video clip:
https://www.youtube.com/watch?v=ptAubfuN8N4
install video:
https://www.youtube.com/watch?v=6b9nQOYa4Hk