DNA MOTORING 3" Stainless Steel Exhaust Tubing Kit — 8-Piece Mandrel-Bent (304 SS, 18-Gauge)

DNA MOTORING’s ZTL-30SS-8P is an 8-piece 3-inch stainless-steel mandrel-bent exhaust tubing kit designed for DIY fabrication and universal fit applications.

This kit supplies a flexible selection of straight and bent sections so you can build or repair custom exhaust runs for cars, trucks, motorcycles, ATVs and other projects. All pieces are made from 304 stainless steel with mandrel bends to preserve internal diameter through curves, and slip-fit ends to speed assembly without specialized tooling. The kit includes straight lengths and common bend angles so you have multiple routing options when fabricating or modifying exhaust systems.

What pieces are included and what sizes should I expect?

The ZTL-30SS-8P kit bundles eight pieces in a 3.0" outer-diameter format: two straight tubes, two 90° bends, two 45° bends and two 180° U-bends. Wall thickness is 18-gauge, striking a balance between workable weight and strength for typical exhaust work.

• 2 × straight 3.0" OD mandrel-bent tubes
• 2 × 90° mandrel-bend elbows, 3.0" OD
• 2 × 45° mandrel-bend elbows, 3.0" OD
• 2 × 180° U-bends, 3.0" OD
• 18-gauge wall thickness, 304 stainless steel construction

How does mandrel bending matter for exhaust performance and fabrication?

Mandrel bending keeps the pipe’s internal diameter consistent through the curve, which reduces flow restrictions and turbulence compared with crushed-radius bends. For DIY fabricators, these smooth-radius sections make it easier to predict routing, weld consistently, and assemble slip-fit joints.

• Consistent inner profile reduces backpressure risks in custom routes
• Smoother weld seams and simpler gasket/muffler mating surfaces
• Predictable bending radius helps when matching to aftermarket components
• Durable 304 stainless resists corrosion in typical exhaust environments

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

The kit is designed for slip-fit assembly so pieces slide together for tack-welding or clamping with minimal measuring and shaping. Its universal 3.0" OD sizing fits many aftermarket mufflers, resonators and clamps; minor grinding or adapters can be used to join dissimilar fittings.

• Slip-fit ends enable fast mock-up and alignment
• Common 3.0" OD mates to a wide range of mufflers and accessories
• Cut, trim or add adapter flanges for bespoke installations
• Stainless finish reduces prep time prior to welding

What are the construction details and durability expectations?

Each tube is formed from 304 stainless steel and mandrel-bent by CNC equipment to maintain uniform wall thickness through the bends. The 18-gauge walls deliver adequate rigidity for exhaust routing while remaining workable for cutting, grinding and welding during DIY projects.

• 304 stainless offers good corrosion resistance and longevity
• Computerized mandrel bends preserve cross-section through curves
• 18-gauge wall balances weight and structural strength
• Slip-fit design simplifies temporary holds and final welding

Who is this kit for? DNA MOTORING’s ZTL-30SS-8P is aimed at home fabricators, custom exhaust shops, track-day tuners and hobbyists who need a ready set of mandrel-bent 3" sections to build or repair exhaust systems. If you work on cars, trucks, motorcycles, ATVs or custom projects and want corrosion-resistant tubing that’s easy to mock up and weld, this universal kit gives common angles and straights to accelerate fabrication without sourcing each piece separately.