HomeAll RepliesReply To: 6.2 Denali/Sierra should have dual exhaust! Reply To: 6.2 Denali/Sierra should have dual exhaust! Sponsored February 1, 2014 at 9:53 am #53014 Z15Participant Why? Because it cost them more to produce it with that. Save a nickle here, a dime there and they increase their profits. Sponsored Subscribe to GM Authority For around-the-clock GM news coverage We'll send you one email per day with the latest GM news. It's totally free. First Name Last Name Email Address Subscribe via Email Leave this field empty if you're human: Sponsored