Stainless Bros 4in SS321 Straight Tube - 16GA/.065in Wall - 48in Length

What you get here is a 48-inch length of 4-inch diameter straight tubing from Stainless Bros. This piece is made from SS321 stainless steel, which is a popular choice for exhaust work because it holds up well to high temperatures and corrosive exhaust gases. The tubing has a 16-gauge wall thickness, which is about .065 inches, giving it a solid feel without being overly heavy. It's a straightforward piece of raw material, ready for you to cut, bend, and weld into whatever custom exhaust system you're building.

SS321 is a bit different from standard 304 stainless because it contains titanium. This addition helps prevent carbide precipitation at high temperatures, which can make the steel more resistant to corrosion and cracking over time, especially in demanding exhaust applications. This makes it a well-built option for anyone fabricating a custom exhaust system, whether it's for a performance build or a repair that needs to last. The 4-inch diameter is common for larger trucks or performance vehicles where increased exhaust flow is a goal.