DO IT! i got one myself, it looks damn good. plus if u put aftermarket speakers, it will increase output of the overall power of speakers, u can never get that from the stock ones

 

where can i find a adapter/harness to connect the stock wiring to the new flip out? how much?

 

No offense bud,

but that unit looks like the biggest P.O.S ever off of ebay.
Save yourself the aggravation of having it break in 3 months and having to replace it anyway.

If you're gonna go aftermarket, go with Panasonic, Alpine, JVC (maybe), Kenwood, Pioneer or Eclipse.

 

Parts needed - $15-$20 Wiring Harness, $15-$20 Dash kit, $10 Antenna Adapter (Need Powered Adapter if your vehicle has an internal antenna) Or if you know someone you can get em for $2, $2, $1

If you have a factory premium sound package on your 98 (Bose), you might be able to pick up a harness that will hook up to the amplifier plug with RCA's. I have not seen them but I have tried using the Bose Amplifier via RCA's and it has turn on/off pops, but this method will ensure all speakers (mids and tweeters) are working. You can cut out the amplifier and run the speakers off your deck...but you need a number of modifications. I have cut out the amplifier and put in aftermarket amps, speakers, sub.

If you do not have premium sound, you can get a VW / Audi plug at your local shops (Best Buy, Circuit City, Magnolia, etc). Very easy install and straight forward color matching of the harness.