Anyone who operates a GMC knows that when it comes to repairing their vehicle only the absolute best replacement parts will do. The vehicle in your driveway is head and shoulders above the rest when it comes to all the cars, trucks, and SUVs these days. You picked your Sierra 1500 HD Classic because its reliability and longevity struck a chord inside you; so why would you be okay with second best when it comes to superior quality auto parts? Make no mistake, you bought your Sierra 1500 HD Classic because you knew that you wanted horsepower and rugged design both rolled up into one vehicle.
Achieving maximum fuel efficiency while reducing emissions on your car or truck depends on your use of properly functioning exhaust and emissions parts. In order to make the combustion process as efficient as possible inside your GMC Sierra 1500 HD Classic engine depends greatly on your exhaust manifold, and its ability to funnel exhaust gas out of the cylinder head. Should you develop a leak in your GMC Sierra 1500 HD Classic exhaust manifold, then you can count on a couple of problems. First, your exhaust flow will change; potentially reversing the direction of the gases inside the exhaust manifold back into the combustion chamber. Second, you will emit exhaust gases before they reach the catalytic converter; creating an unpleasant smell and potentially hazardous condition for you and your passengers.
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