DNA MOTORING 3.0" Stainless Steel Mandrel-Bent Exhaust Tubing Kit — 16-Piece Universal 18-Gauge, Slide-On Ends

DNA MOTORING ZTL-30SS is a 16-piece 3.0-inch stainless steel mandrel-bent exhaust tubing kit designed for DIY custom exhaust builds on cars, motorcycles, ATVs and fabrication projects.

This universal kit contains a balanced assortment of straight, 45°, 90° and 180° U-bend sections, all with 3.0" outer diameter and 18-gauge walls. Each pipe is mandrel bent to maintain consistent internal diameter through bends, reducing flow restrictions and making it easier to assemble a smooth, straight-through exhaust route or compact routed systems. The slide-on terminals simplify fitment for hobbyists, fabricators and home mechanics who want a flexible set of components without cutting and welding an entire custom-mandrel shop setup.

What pieces are included and how do they fit together?

The ZTL-30SS kit includes 4 straight sections, 4 forty-five degree bends, 4 ninety degree bends and 4 180 degree U-bends — sixteen pieces total. All sections share a uniform 3.0" outer diameter so they can be mated directly for many configurations using clamps or welding as preferred.

• 4× straight pipes for length and extension
• 4× 45° bends for gradual directional changes
• 4× 90° bends for sharper routing around obstacles
• 4× 180° U-bends for tight returns and compact layouts

How does the stainless steel mandrel-bend construction help performance?

Mandrel bending preserves the tube's internal diameter through curves, avoiding the necking that can occur with crush-bent pipes. That smoother internal contour promotes steadier exhaust gas flow and reduces turbulence compared with non-mandrel bends, which is useful when building performance-inspired or efficient exhaust paths.

• 18-gauge stainless steel resists corrosion while remaining workable
• Mandrel bends keep a consistent bore through elbow sections
• Smoother flow reduces hotspots where restrictions can form

How easy is this kit to install and adapt for different vehicles?

The slide-on terminal design enables quick mock-ups and temporary fits without immediate welding, letting you test routing before final assembly. For permanent installations you can clamp and weld, or use couplers; the uniform 3.0" OD makes selecting joining hardware straightforward.

• Slide-on ends for rapid alignment and fit checking
• Universal 3.0" OD fits common mufflers, tips and couplers
• Suitable for welding, band clamps, V-band adapters, or silicone couplers with reducers

What are typical uses and limitations of this DIY exhaust kit?

This kit is ideal for custom routing, mock-ups, small fabrication tasks and repairs where a 3.0" diameter is appropriate. It is not a complete system (no mufflers, hardware or flanges included), so finishers should plan to add clamps, gaskets or welding and any vehicle-specific adapters required for sensors and mounting points.

• Great for custom muffler connections, mid-pipes and motorcycle projects
• Not a bolt-on complete system — additional parts may be required
• Check fitment for oxygen sensors, mounting brackets and clearance points

Who is this for: The DNA MOTORING ZTL-30SS kit suits home mechanics, fabricators, hobbyists and small shops that need a flexible set of mandrel-bent 3.0" tubing for prototype assemblies or custom exhaust work. If you want durable stainless sections with consistent internal geometry for cleaner routing and easier fabrication, this kit offers a practical, affordable starting point — but plan to supply clamps, welding or adapters for a finished installation.