Frequently Asked Questions About GMC General Truck Universal Elbows, Piping & Components

What material are these universal elbows made from, and will they rust or corrode over time?

Most universal elbows for GMC General trucks are manufactured from either aluminized steel or 304/409 stainless steel. Aluminized steel options provide good corrosion resistance at a lower price point and typically last 3-5 years depending on your climate and road conditions. Stainless steel elbows offer superior longevity and can last 10+ years even in harsh environments with road salt exposure. When selecting elbows, check the product specifications for material type and consider your local weather conditions and how long you plan to keep your truck.

Will these universal elbows fit my specific GMC General model year, and what are the common size options?

Universal elbows are designed to fit GMC General trucks from 1960-1987, but you'll need to match the correct diameter to your existing exhaust system. Common sizes include 4-inch, 5-inch, and 6-inch diameter options. Most GMC Generals with factory exhaust use 4-inch piping, while trucks with performance modifications often require 5-inch or larger. Before ordering, measure your current exhaust pipe diameter at the connection point, and verify whether you need ID (inside diameter) or OD (outside diameter) fitment based on your clamp style.

Do I need special tools or welding equipment to install these elbows and components?

Installation requirements vary by product type. Slip-fit elbows with band clamps can be installed with basic hand tools like wrenches and a socket set - no welding required. These are ideal for DIY installation and typically take 30-60 minutes. Weld-on elbows require MIG or TIG welding equipment and experience, but provide a permanent, leak-free connection. If you choose weld-on components without welding experience, budget an additional $50-150 for professional installation at a muffler shop.

What's the difference between mandrel-bent and standard elbows, and which should I choose?

Mandrel-bent elbows maintain a consistent inner diameter throughout the bend, providing better exhaust flow and reducing backpressure - important for performance applications or turbocharged engines. Standard crush-bent elbows are more affordable but create slight restrictions at the bend points. For stock GMC General applications, standard elbows work fine. Choose mandrel-bent if you've upgraded your engine, added a turbo, or want maximum exhaust efficiency. The performance difference is typically 3-5% in flow capacity.

What angle options are available, and how do I determine which angles I need for my exhaust routing?

Common elbow angles include 45-degree, 90-degree, and 180-degree bends, with 90-degree being the most frequently used. To determine your needs, use a piece of flexible wire or string to mock up your desired exhaust routing, then measure the angles required at each turn. Many GMC General owners find that a combination of one 90-degree and one or two 45-degree elbows provides enough flexibility for most custom routing needs. Consider purchasing an extra 45-degree elbow as these are useful for fine-tuning your exhaust alignment during installation.