I'm planning to put 19" Tenzo's on my xB. Could I still use the stock springs or do I need to move to a coilover?

Since the 215/35R19 set up is larger than the OE set-up so if you run the OE suspension set-up, your car will look lifted. If you want it to sit cleanly, I'd at least put some springs in. With 19's you'll probably want to go with the 2" drop SPY springs. Eric M had that set up and can probably give you soem insight.

www.scioned.com