Premium 16-gauge steel construction of both tubing and mufflers to provide long lasting performance, Each tube is expanded on one end to allow easy slip fit installation, 2.5\" mandrel bent tubing is full size throughout the bend for maximum flow and increased power, Two chamber mufflers with twin baffles to reduce drone and interior noise while maintaining a deep powerful tone, Mufflers are offset inlet and center outlet configuration to fit a variety of muscle car and hot rod applications 2.5 Inch Deluxe Dual Exhaust System Kit with Mufflers, Mild Steel Sku # 91013825 Mfr. Part # 91013825 Condition New Brand Speedway Motors Sold Kit Details
- 2-1/2-inch 16-gauge mild steel tubing with .065-inch wall thickness for easier welding
- Mandrel bent tubing maintains inside diameter throughout exhaust pipe flow path
- All tubing can be cut and easily welded at any bend radius due to mandrel bending process
- Oil coating applied to prevent corrosion after manufacture that delivers clean, ready to weld tubing
- Once cut and welded it is recommended to use high-heat paint or ceramic coating to protect exhaust
- Each tubing piece includes an expanded end for easy slip-fit installation
- Complete universal dual exhaust kit includes 16 pieces of tubing to build a complete custom exhaust system
- Dual exhaust kit includes 16-gauge welded steel two chamber mufflers in high-temp black coating
- Clamps, hangers, or finished tailpipe tips are not included but available separately
- Bent exhaust tubing features a 3-3/4-inch bend radius on all pieces
Design Your Own Exhaust System with Our Complete Header Back Exhaust Kits
Many builders look at the exhaust portion of a project build with skepticism and disdain. It is normally one of those aspects of a project where you know it is going to entail delivering your project vehicle to an exhaust fabricator and having a complete header to tailpipe custom exhaust system built at great expense. It is even more fun when you do not own a truck and trailer to transport said vehicle yourself too! However, we are here to tell you that you can indeed fabricate your own custom exhaust right in your home garage or workshop with ease using one of our complete mild steel dual exhaust pipe kits we offer here at Speedway Motors. All it takes is a welder, something to measure and cut the piping with, and a little bit of exhaust pipe system routing forethought to accomplish.
Heavy Wall 16-Gauge Tubing for Easy Welding and Fabrication
We start by spec’ing .065-inch thick 16-gauge mild steel tubing for our mandrel bent exhaust pipe kits. This steel is easier to weld by far when compared to standard 18-gauge steel normally used for exhaust tubing. The thicker gauge material provides “forgiveness” when welding if your welding machine settings are not spot on, making it easier for novices with basic 110-volt MIG welders to weld up the perfect custom exhaust system. We provide four 46-inch lengths of straight pipe for the main exhaust pipe run along with four lengths of each bend type: 90-degree, 45-degree, and 180-degree U-bends. These bends allow you to fabricate the optimum dual exhaust system routing around crossmembers and over your vehicle’s rear axle simply by measuring, cutting, and welding the bend sections as required.
Welded Two-Chamber Mufflers Included for That Classic Sound
Our mild steel universal dual exhaust pipe kit utilizes 2-1/2-inch exhaust tubing and ships with our matching two-chamber welded steel mufflers. These mufflers feature an offset inlet with center outlet design and have a case dimension of 13-inches long, 9-3/4-inches wide, and 4-inches thick. Including the inlet/outlet bushings these mufflers are 19-inches long. These welded two-chamber performance mufflers provide that great classic deep aggressive exhaust note we all love while minimizing interior drone that can ruin your road trip. The twin baffle design creates a scavenging effect to help pull the exhaust through the muffler, increasing horsepower and torque. Constructed of 16-gauge steel, the case and internal steel baffles are full welded, meaning there is no internal packing material to burn up or blow out, so your exhaust sounds the same on day 1 as it does many years down the road. You can also find exhaust installation accessories including Exhaust System Hangers and Accessories and Exhaust System Tips on our site.
Extra Exhaust Tubing is Just a Call or Click Away
Sometimes we measure twice, cut once, then cut again, and still come up with the short end of the stick, or in this case, exhaust pipe. Have no fear, Speedway Motors offers individual replacement angle tubing and additional lengths of straight tubing in case you have a project with a long wheelbase like a station wagon, panel van, or other unique scenario. If you know what you need you can order these along with your hot rod DIY exhaust kit, otherwise, know these parts are ready to order to get you fixed back up and your exhaust project finished in no time if you make a mistake with your exhaust fabrication.
45-Degree Mild Steel Bend
90-degree Mild Steel Bend
180-degree Mild Steel Bend
46-inch Length Mild Steel Straight
Dual Exhaust H-Pipe Balance Tube
Extra Exhaust Tubing is Just a Call or Click Away
Sometimes we measure twice, cut once, then cut again, and still come up with the short end of the stick, or in this case, exhaust pipe. Have no fear, Speedway Motors offers individual replacement angle tubing and additional lengths of straight tubing in case you have a project with a long wheelbase like a station wagon, panel van, or other unique scenario. If you know what you need you can order these along with your hot rod DIY exhaust kit, otherwise, know these parts are ready to order to get you fixed back up and your exhaust project finished in no time if you make a mistake with your exhaust fabrication.
45-Degree Mild Steel Bend
90-degree Mild Steel Bend
180-degree Mild Steel Bend
46-inch Length Mild Steel Straight
Dual Exhaust H-Pipe Balance Tube
Specs Exhaust System Type Header-Back Single or Dual Dual Sound Level Aggressive Muffler(s) Included Yes Muffler Quantity 2 Muffler Connections Single Inlet | Single Outlet Muffler Type Chambered Exhaust Tip Included No Exhaust System Material Mild Steel Exhaust System Finish Natural Exhaust Pipe Color Natural Muffler Inlet Diameter 2.5" Muffler Outlet Diameter 2.5" Muffler Overall Length 19" Muffler Body Length 13" Muffler Body Width 9.75" Muffler Body Height 4" Muffler Material Mild Steel Muffler Finish High Temp Coated Muffler Color Black Mount Type Universal Inlet Quantity Single Tailpipe Diameter 2.5" Mandrel Bent Yes Wall Thickness .065" Catalytic Converter(s) Included No Hardware Included No MFG. Part # 91013825 Sold in Quantity Kit Exhaust Tubing Diameter 2-1/2 Inch Material Type Mild Steel Exhaust System Kit Type DIY Universal Reviews Bought for a truck build Rated by Kizerklan on July 27, 2026
Summary: Seems like a good deal and so far its going together great
Yes, I recommend this product.
Yes for the next build Rated by Holmes on July 05, 2026
Summary: Works perfect couldn't ask for a better muffler system
Yes Rated by 69 Nova on June 24, 2026
Summary: Installed on a 69 Nova , was pretty easy and pretty straightforward .
Yes, I recommend this product.
Worked well for my install on old 1957 Chevy 3100 truck Rated by 57 Mel on April 04, 2026
Summary: Fit well and plenty of pipes to make it fit
Yes, I recommend this product.
Excellent kit, super fast shipping! Rated by Ruby 56 on February 04, 2026
Summary: Materials, bend angles and expanded dimensions were spot on. Built an exhaust from the headers to the rear bumper. Had plenty of tubing and several pieces leftover.
Yes, I recommend this product.
Related Items / Suggested Parts Speedway Motors Deluxe Bolt-On Exhaust Hardware Kit, 2-1/2 Inch Universal Dual Exhaust H-Pipe Balance Tube Kit, 2-1/2 Inch 2.5 Inch Dual Exhaust Pipe Tubing Mandrel Bend Kit, Mild Steel Flowmaster 15936 2-1/2 Inch U-Fit Universal Dual Exhaust Kit Speedway Poly Exhaust Hanger Grommet Bushings Steel Exhaust Hanger Brackets, 4 Inch Speedway Motors Weld-On Exhaust Hanger Bracket, 10 Inch Long Tight-Tubes Block Hugger Header Extension Kit, Mild Steel Speedway Motors Bolt-On Exhaust Hanger Bracket, 1.5-2.5 Inch Steel Exhaust Collector Ring, 2-1/2 Inch Exhaust Reducer, 3 Inch I.D. to 2-1/2 Inch O.D. Collector Gasket - 2 1/2 Inch Inside Diameter Tech Support We\'re here to help before and after your purchase. If you have a question or need assistance with one of our products, please contact us through Messaging and a knowledgeable Speedway Motors team member will be happy to help. About Speedway Motors is America’s Oldest Speed Shop® and has been a trusted source for specialty rodding and racing products and friendly expert advice for more than 74 years. Founded in 1952 by “Speedy” Bill Smith – a racer and street rodder himself – Speedway has grown from a one-man operation to become the world’s largest manufacturer, distributor and retailer of street rod and racing products. Our industry-leading fast delivery is the result of same-day shipping from our state-of-the-art, centrally located 500,000 sq. ft. headquarters. Speedway’s size offers customers unmatched product selection and low pricing, while our excellent technical support and customer service have made us a recognized leader in the rodding and racing industries.
![Speedway 2.5\](parts-image-large/g/mLgAAeSwGGJqkb-r/s-l1600/Speedway-2-5-Mild-Steel-DIY-Custom-Mandrel-Exhaust.jpg "Speedway 2.5\")
