After getting disappointed by my stock HU where it couldn't playback my MP3 CDR's, i got the 3100 along with the SWI-PS interface for the steering wheel buttons. i dont need nav and i wanted the USB flash drive on the front so went with the pioneer.
the bracket screw holes lined up perfectly so it was a very easy install.
the factory harness is long and plenty of space inside to work.
made my own gasket trim around the headunit using some EZ Felt so that there is absolutely no gap between the HU and the factory bezel. also removed the thin felt gasket that was on the opening of the bezel. i just took some RC car motor spray and wiped it off. it makes the install look much cleaner.
here's wat it looks like. factory finish.
thanks for the DIY's and all the picts on this site. it made my install very easy.
here's how i have my EQ setup on the pioneer using stock speakers. i made the setting with the volume at 10 with the driver side window down.
I used MP3 files with ASR1 turned on.
EQ:
Low: 40Hz/1Narrow/+10
Mid: 500Hz/2wide/+4
High: flat
Loudness, bass boost, etc. OFF.
Hope this gives you a starting point.