The dash is a double DIN sized opening, the DIN + 1/2 you're looking at probably isn't the best fit.... you could make it work but I would expect to see gaps at the top and bottom once the bezel is put back on. If you replace the head unit in a Monsoon equiped Bonneville, you cannot retain the use of the factory amp. You could bypass the amplifier, but then the problem is that the each factory speaker is powered and crossed over individually on each channel through the factory amp. You'd have to use a passive crossover network to combine the front door woofers and tweeters or replace the speakers and run a full range signal to the lower door (either ignoring the tweeter or wiring it in parallel). The rear doors I wouldn't even bother with. The rear 6x9s are low passed to act as subwoofers. If you're expecting full range sound of out those, you'll need to replace them with new speakers as well. This is very much one of those cars where you are best served to replace everything or leave the head unit alone (unless you do the Delphi Nav install, which is great for functionality but won't really do anything more for ya with sound quality). If you choose to tackle this car, be prepaired as its going to be far from simply replacing the headunit. If you have specific questions, please ask.

My biggest question is how to install a head unit in this car and make it look good. I have already installed focal components in the front doors, utilizing the Monsoon'* built-in crossovers. That sounds decent with the Monsoon amp. Next i added a 4 channel amp Kicker amp using speaker-level inputs from the Monsoon'* front outputs and patching into the wiring harness. 1 channel per mid and 1 channel per tweeter did the trick. The sound just wasn't anything special so I know that the factory system has to go.

My next step is to find a suitable deck (preferably with MP3) and install. Run all RCA'* to the back and amplify the front components. Use the deck'* built in power for the rear doors. (Patch into harness in trunk if necessary). Remove the crappy rear deck sub speakers (eventually install a sub instead). Reinstall passive crossovers in doors and get amp running.

So my biggest questions are: which radio to put in, and what kit to purchase to make it look good. (No heavy modifications). What antenna adapter to use so that both of them function. Are there any wiring harnesses that will save me time.

I would like to use the steering wheel controls but don't care about chimes, onstar, audio HUD, etc.

Thanks for any input.

I think my plan is to replace the head unit with the Delphi TNR800, with the Fosgate sound processor, the Polk Audio amps and speakers I had already picked out, and a Delphi/Pioneer CD changer.

That way, I keep most of the factory functionality, upgrade the display significantly, add navigation, ditch all of the HU'* limitations (the TNR800 has no onboard amps at all) and get the sound I want. And a CD player.

Of course, if we can't get replacement parts for our GXPs, they'll become garage art soon enough .. yours and mine will just have kick *** stereos.

Mine already does....

Brag, brag, brag...

So, what do YOU have installed?

http://www.bonnevilleclub.com/forum/...ic.php?t=80502

the trim ring is being made and will go in this week

that powers

1. 400.4 Massive amp
2. 1000.1 massive amp

Massive components
and 2 Massive subs (temp)

there are plans for
2. Massive 3000.1'*
and
2 massive 15' Massive DMX comp subs in a custom fiberglass enclosure.

I used the Scosche single DIN dashkit for my car, as I prefered the way it looked, but there are other kits out there by Metra and American International.

This is a picture of my headunit installed in the dash
http://bayimg.com/dAdDbaAbB