RoadGlideSully

I have not really noticed any significant changes in MPG. To be honest, that could be influenced by the fact that my right foot has gotten heavier wanting to hear the air flow which is only really present for me at lower speeds.

Finally got around to doing the install on my 21 Sierra. Install: I'm not a mechanic but am pretty damn handy. I'd say the install was a bit more difficult than I expected after watching the S&B install video. Lots of tight spaces to get things (including my huge hands) in and out of. It's difficult, but if I can do it, it's not impossible by any means. Took me about 4 hours total. Sound: It's a bit quieter than I expected but on deceleration you know it's there. Responsiveness: I noticed a little quicker throttle response at the low end from a start. I haven't really put it through it's paces yet but overall I'd say there is a slight performance gain. MPG: I have only driven it about a 100 miles since install. Thus far I'm getting maybe .5-1 MPG better but I've been pretty easy on the right pedal maybe more so than in the past. Net Net: I'd say it's a good value if for no other reason than the bottom end acceleration I have experienced so far. Feel free to ask questions.

Same thing happened to me at around 200 miles. Drained the batter cranking (several tries). Took it to the dealership and they replaced the battery. Happened again at around 600 miles. Battery held up this time but it was consistent problem for about 5-6 tries. Waited about 15 mins (after calling a tow truck) and it started right up. Took it to the dealership and it threw no codes and and they of course couldn't replicate it. Hasn't happened since. I'm now a bit leery about having found this thread and knowing several others are having a problem. Hoping now there may be a recall in our future once they figure out what the hell is happening.

Just ordered mine today. I'll provide some additional feed back once I get it all set up.