I bought one and it worked fine until I swapped out my gauge cluster to a Denali cluster. Something in the computer doesn't like the swap. I started having problems with door locks and different things. I sent it back to Range to have it programmed again and still the same problems. They are taking it back and giving me a refund on it. Like I said, it worked great until I swapped out the gauge cluster. These trucks are very sensitive when it comes to the computer.
I just installed a Corsa on my Sierra. Sounds great under acceleration, but then goes away. I didn't run the tip though, I just dumped it over the rear end. Looks cleaner to me without a pipe sticking out the side.