Hey there.
Finallly, after a long 2 months saving, I was able to install a custom made ex in my /6. It has 1 3/4" primary, 2" collectors and 2 1/4" to the end. It's 3 to 1 + 3 to 1. I can't tell you how happy I am. Not only sounds great, but revs up much more faster at lower throttle opening, has more power. I gues that the original 1 3/4 original pipes weren't enough for the engine... now I have special cam, tweaked carb (1 bbl but more cfm than a carter 2 bbl) shaved block and head. Runs like I always wanted my /6 to run. Does somebody knows how much ponnies a good ex can add? I feel a lot of diffrence, and not only in the sound. I even feel a diffrence in the shifting of my 904... but that may be just illusions
