Black Cloud Diesel Performance One of the first companies of it's kind in the market, Black Cloud Diesel Performance (tm) has been doing business under it's original & only owner, Gary Nilsen, since it's inception back in 2004! Black Cloud Diesel Performance is located in Amherst Junction, Wisconsin. Black Cloud Diesel is a small company in a small town in Central Wisconsin. You will get personal service and technical application and sales assistance from each of us-customers are our priority, not just a number! If you want to speak to one of us about a part you need, or have any questions about ordering, please call us at 800-872-1944. Our business hours are at least 9AM-5PM CST Monday-Friday, and sometimes more! BLACK CLOUD DIESEL is a quality company committed to providing excellent customer service, while offering you the highest quality Diesel Performance Parts and Diesel Truck Upgrades that protect the longevity of your truck engine, provide heavy duty performance, replacement parts and products that are more efficient for better Fuel Economy and Power. If you want to speak to someone about a part you need, or have any questions about ordering please call us at 800-USA(872)-1944 / 715-254-2307. If there's been a problem with your order, CONTACT US BEFORE RETURNING PARTS FOR CORRECT RETURN ADDRESS AND RETURN NUMBER. If you send a return to the office address, you will be charged what it costs us, to ship your core from our office to the manufacturer. If you order using a credit card, you will see NilsenCorp/Black Cloud Diesel on your statement.