yea they stock speakers will sound beta, to an extent only because the stock HU can supply so much power and the stock speakers have a maximum Watt ratting of round 40 ish, well thats what my stock speakers were ratted at, useless really.
ugh il have to say my first 2 cars were honda's.... 91' Honda Prelude XX and a 90' Honda Civic 3door, I sorta smashed this car up, knocked some ***** off his scooter at a roundabout who failed to give way lol and now my 96' Levin :D
no the controls on the steering wheel wont work with any aftermarket HU ul find putting a new HU in any toyota being a pain in the ****, the colours dont always represent what you think they would be. i suggest finding a wiring loom that will fit your toyota's socket (generally where all your wires from the HU go on a another socket) that will plug into the back of the type of HU you have selected.