Hey guys i have an 01 GTP and i want to install an aftermarket deck with aftermarket amp and subs BUT i want to keep the factory amp with speakers and also steering wheel controls.
Whats do i need to keep the factory amp working and also the steering wheel controls?Will a normal harness work and keep the factory amp working?

Also does a double din fit in a 01 gtp nicely or is there modification needed?

I did searching but wanted a direct answer to my questions so i do this all right.

Thanks in advance for all your help

For either a single din or double dinit will either be jvc or for double din im looking at the sony 6.1 XAV62BT not that it matters i dont think