DON'T USE THE TITANIUM SET!!!\
I did bought them too for my savvy, and after a week all tooth from the titanium gears were almost gone
The delrin gears are useless. I have an complete delrin gearset laying around, but haven't used cause even nitro breaks it...
Also an stupid thing, it is based on the OLD savage x 2-speed(delrin gears). So the clutch system doesn't works very properly...
I did run the titanium set with the flux idler gear. the idler gear is brand new, the rest is almost broken... Lots of metall in the gearbox from the tooth
So don't buy them damn things...
Greetz,
Joram