Does this bolt directly to the stock catalytic converter?

Yes, this catback bolts to your factory cat converter. You're only replacing everything downstream. Use new gaskets and clamps when you install it.

Will I need to modify my bumper or exhaust hangers?

The system uses factory mounting points. No bumper modification required. Check that your existing rubber isolators and hangers are in good shape before install.

Can I install this with basic hand tools?

Yes. You'll need a socket set, jack, and jack stands. Remove the wheels, unbolt the old system from the cat and rear hangers, and slide the new one in. Expect 1–2 hours if you take your time.