One of our members in Germany is producing stainless steel downtubes.
They are matching all Z750Twin models and are without “H-tube”-connector. They have an upswep angle welded in for use with straight silencers.
The downtubes are single-walled, have a much larger inner diameter than the double-walled stock downtubes.
This will lead to a bit more power at higher revs, bit of loss of torque in lower revs and for sure they will get the typical tempering colours. That is unavoidable with single-walled tubes.
They can be ordered as bare metal or polished version.
Price is 270,- Euros for a pair (left and right one) of downtubes (unpolished) or 450,- Euros (polished).
Plus shipping cost and it will be a large parcel !
There are no silencers included and you can use typical aftermarket silencers of your choice.
If you are interested, just contact me and I will forward to Peter, who produces the downtubes.
Attached pics show the unpolished version with long or short aftermarket silencers as quick mock-ups.
Correctly mounted it is possible to remove the rear wheel axle without removing this type of silencers: