Hi, Peoples just wondering if you can hook up an amp to the stock system in the TJ?

Or does it depend on the amp?

Depends on the amp - there are no RCA's on the TJ headunit, so you need an amp with high level inputs, or use high-to-low level converters.

The switch wire may also have to go to the ignition as IIRC there is no such provision for this.

Cheers
Heath Young