Sub Question..

[King GTS]

It's not an RT/10 but this is what I did with my Viper. Good luck.

Viper Stereo Pics

 

[shifter]

A bit less involved than King GTS's electronic make-over, but 1000% better sound. Gettign bass with the top off is like getting sweet sounds from those hood speakers (should edit your last post before the jokes start flying):

http://vca1.viperclub.org/ubb/Forum14/HTML/010155.html