I was just thinking about welding a 3" flapper tip to a flange that will bolt on to the downpipe flange from my headers so I can remove the entire exhaust for track use only. That would drop some weight and high rpm backpressure while still maintaining some low end torque.
May have to increase the backpressure spring slightly, and fab up a 316 ss pin to replace the stock 409 one but it just may work...........open headers.
It would be loud as hell, like when I drove to the muffler shop with open headers to get the exhaust flange welded on. The lack of low end torque was noticeable but when I put the hammer down....
Just an idea right now for a future project.
What do you guys think