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I happen to have an email exchange with Yan at Brz today and here is what the 75-90cc pipes look like. I was quoted pricing at $150 eruros each & $60 euros shipping. I was told they were designed on a da170 platform. 28mm input, 850mm length, 53mm big diameter & hard to believe 81.75 grams!!! A true talented craftsman!
I was hoping for a design more as an expansion chamber with a proper divergent cone and convergent cone like his smaller pipes, but that's just me. Designed correctly knowing port timing and other variables big power gains can be made with expansion chambers. I have designed and built a couple myself and actually reached out to Yan to possibly clone one of my designs.
That said, I am really interested in one of these for a ZDZ80 RVJ for a kit I have on the shelf.
I'm working on negotiations for a possible partial trade. We'll see what develops.
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