Test of DG heads and exhaust on a '75 RD350...

[Brad-Man]

https://magazine.cycleworld.com/article/1978/3/1/quick-power-for-yamahas-rd

[The Red Scourge]

From what I've read here over the years, it seems that the current thinking is that DG heads don't actually net any performance gains.  Has anyone had any luck with them?  I mean, they do look awesome.

[1976RD400C]

I did that drag strip test with my 400 and just the DG pipes back in the late '70s. 14.2 to 13.7