worth the effort to improve performance
Reviewed By Mary B (Covington, VA) Reviewed for a 2011 GMC Sierra —9/9/2014 9:00 AM
Quality parts, did not take long to install, does not seal from engine compartment like I thought it would,performance improved, gas mileage seems to be better, only been on truck for a couple of weeks. Shipment very fast.good parts.
Too early to tell but so far so good
Reviewed By Harry B (Cupertino, CA) Reviewed for a 2010 GMC Sierra —8/28/2014 12:42 PM
I just installed it today. Already noticed increase in hp and waiting for increase in mpg. Straight-forward to install. Easy to lay out. Directions were very clear and well done.