GMC Envoy problems
Having issues with a 2005 gmc envoy, seems to be down on power or not downshifting properly. UPDATE 3/26/15: The problem has since been fixed, clogged catalytic converter was to blame, and a misfire was discovered which probably clogged the cat.
Envoy Denali 12 sec pass
My Envoy Denali vs a GMC Sierra Finally broke into the 12's at the 1/4 mile and still spun off the line. In this run it spun a little and got a 1.8 60ft but the second pass It ran a 1.749 60ft but didnt get it on video. Should be able to get at least a 12.3x out of it with a lower 60'.
04 GMC Envoy speaker problems
I do know what the issue is, I did test it and this is a VERY common issue for the GM trucks and SUVs of the era. There is about a 90% chance that I will be filming the installation of the new speakers, well, probably just the one door since it is the same on both sides. Actually uxwbill had a similar issue with this 07 Silverado Classic, here's a link to his video. https://youtu.be/cTElmqWXeVE?t=15m3s Also I do know what the issue is with the Check Engine Light, the parts are on order for that.