the city is cheap and easy for just adding 10% topend to an otherwise bone stock setup (maybe +1 jet size)
the speedy++ and a +1 or +2 upjet and higher flow airbox is my go-to ciao, bravo and grande pipe/combo for almost all my mild-kit or stock(ish) builds, its still really quiet but adds noticeably more torque via the long wide header and top speed improves by sayyyy about 20% on any combo of stock or mild kit carb/cylinder
BUT....that gianelli is even better than both of them... tons o' header for great lowend and gets even better top speed than a city or a speedy++ (more like 25%+ improvement with a good carb and upjet +2 or so) ... it is a bit louder though, not like circuit pipe loud, mind you, but its much more audibly obviously nnnnot stock at revs (edited)