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Installing Bellowed Up-pipes on the diesel truck is the perfect treatment for the much too common diesel exhaust leak. The stock Ford up-pipes are made employing a crush donut gasket to seal the up-pipes to the y-collector. Over time, expansion and contraction make the donuts to leak, hurting engine performance and mileage. One of the most common problems with hvac equipment is poor ventilation. This problem makes your hvac equipment work like inefficient outdated models which can waste plenty of your money. The two most common reasons behind poor venting: inadequate duct sizing as well as a dirty return air filter.