the tomos estoril on a gila works really well, the puch estoril on a gila doesn't rev out past about 8500-9k
they are quiet and sturdy and if you gear tall and aren't trying to drag race it makes a really nice setup.
the crank pipes are really nice too, super solid, well worth the money. Ryan just made one for me but left the header all un-welded and un-panted so i can mount it up custom on my raceybike. They hit nice and low like the estoril but they just keep on revving to infinity... its really insane how fat and meaty the power is on them.