Have you ever wished you had a stack AND a conventional exhaust tip? One of our readers did...

 And he built himself a retractable stack system for his ’08 GMC Sierra. When he's towing a trailer, it's kept clean and free of soot accumulation thanks to his 5-inch miter-cut stack in the bed. But once he's unhooked from the trailer, the stack repels down into the toolbox, he switches over the butterfly valve in the exhaust and runs a traditional exhaust exit around town.

You'll read all about it in the January 2012 issue.