I still haven't done anything with the purge control valve but I did finally finish my exhaust system. It's amazing how extending the pipes out the back can quiet things down so much in the cab. I'm using 50series Flowmasters, which are supposed to be a little more mellow but without tail pipes, they still set off a few car alarms.....

I bought a few mandrel bends from Summit Racing and cut to fit. Here are a few pics:

left side over the axle, around the tank & out the back...


Right side....


Finished up with some 3" tips...