I did this mod last night along with installing my RavSpec front lip.. 20min at 200 degrees F worked just fine for softening the housing adhesive. Just remember after you squish the two halves back together to put them back in the oven again for the same amount of time, then press the halves together again to make sure everything is seated well. I got some silicone to put around the seam, but elected not to do it - not sure if I'll regret it or not. It's raining today, so we'll see. BTW, ordered some 3157 bulbs (chrome, blinks amber) from here:
http://autolumination.com/titaniumseries.htm
- Allen.