Chopster Header Set Hemi Engines


The Hemi Chopster header set is an aggressive-looking vertical exit design for fenderless and hoodless classic street rod and rat rod projects. The Chopster provides a unique look that grabs attention.

Sanderson Chopster header set
Chopster Header Set Hemi Engines $725.03$983.97

Sanderson Chopster header set
Chopster Header Set Hemi Engines

Sanderson Headers - No GasketsLooking for an aggressive header set for a hoodless classic or rat rod? The Chopster header set for Chrysler Hemi applications provides a unique look that grabs attention.

Please be sure to select the correct engine group from the drop-down menus.

NOTE: Chopster392 for the Chrysler 331-392 Hemi applications shown

Includes all hardware necessary for installation.



  • Chrysler/Imperial FirePower  331-392 (331, 354, 392)
  • Dodge 241-325  (14-3/8″)  (241, 270, 315, 325)
  • DeSoto 276-345 (14-3/4″) (276, 291, 330, 345)

Primary Tube Diameter:

  • 2-1/4″ for the 426 and 392 Hemi
  • 1-7/8″ for the other Hemi engines


  • 16-Gauge Primary and Collector Tube Thickness
  • 3/8″ Thick Flange
  • Patented Flange Design Requires NO Gaskets
  • Tightest Fitting Header Available Anywhere!
  • Made in the USA


  • Header Bolt Set
  • (8) Baffle Inserts


Sanderson’s Ceramic Coating is recommended for every vehicle application and is the default finish selection choice above. To meet high standards of quality, Sanderson applies a multi-layer inside and outside aluminized ceramic coating in-house and then polishes the coating to a high luster. This aerospace and military-grade technology adds excellent protection to your headers while offering the benefit of thermal control in your engine bay. It also improves cylinder scavenging of exhaust gases and increases the longevity of your header investment.

Additional information

Weight35 lbs
Dimensions34 × 21 × 7 in
Header Finish

Silver Ceramic Coated, Black Satin Ceramic Coated, Plain Steel (raw metal)

Hemi Engine Group

Chrysler / Imperial 331, 354, 392, Dodge 241, 270, 315, 325, DeSoto 276, 291, 330, 345, Chrysler 426

Hemi Engine History

It is important for us to know which Hemi engine is in your vehicle because there is more than one. (This article is provided by Sam of Century Performance Center, Inc.)

First, Some History:

Although it was Chrysler who trademarked the term “Hemi” somewhere within the 1950s, it wasn’t until the second generation Hemi, the 426 that showed up in 1964 that Chrysler started using it to officially define the engine’s name. The name originates from the hemispherical cylinder head and more specifically, the combustion chamber design. The 426 Hemi, often referred to as the “elephant”, became well-known quickly for its use in NASCAR and a few special production vehicle applications. The trademarked name was not officially recognized from a commerce standpoint until February of 1966, 2 years after virtually everyone knew something about it.

However, while most people immediately recognize the term “426 Hemi”, it was not the first Hemi engine. The Chrysler FirePower (not yet coined as a Hemi) 331 V8 was the first, finding itself between the fenders of a few 1951 model year vehicles. And there were others … which gets us here.

Each Hemi engine group uses a different exhaust port and bolt spacing. Therefore, Sanderson headers for the Hemi engines vary slightly to include specific flanges for the port and bolt layout and varying primary tube bend radiuses to accommodate different exhaust port exit angles. Here are the four Hemi engine groups that Sanderson builds headers for. You will see in the list below that the Dodge and Desoto Hemi engines include a dimension. This is the easiest way to determine the difference between those two engine groups. Please refer to the graphics below the list to explain this dimension.

NOTE: Sanderson is not currently offering header sets for late model 5.7L, 6.1L, 6.2L, and 6.4L engines.

  • Chrysler 426 Hemi
  • Chrysler/Imperial FirePower  331-392 (331, 354, 392)
  • Dodge 241-325  (14-3/8″)  (241, 270, 315, 325)
  • DeSoto 276-345 (14-3/4″) (276, 291, 330, 345)

This first graphic shows the 14-3/8″ spacing for Dodge Hemi engines.

Sanderson Dodge Hemi flange

This second graphic shows the 14-3/4″ dimension of the DeSoto Hemi engines.

Sanderson DeSoto Hemi flange

If you have any questions regarding the proper engine group or flange selection, please reach out to us by phone or through our Helpdesk.

Baffle Installation

Zoomie and Chopster Header Baffle Inserts:

Sanderson does NOT provide mounting holes for mounting the muffler baffle inserts due to possible liability issues. Safe installation and proper securing of the insert are the responsibility of the customer or installer.

Baffle Installation Procedure:

  1. First, make sure the inserts are the correct size for the application. Sanderson’s 1.875″ (1-7/8″) inserts are for small block engine applications, and the 2.250″ (2-1/4″) inserts are for big block engine applications.
  2. For NEW installations – Notice that one end of each Sanderson muffler insert is partly closed off with a welded washer.
  3. Use a tape measure to determine the depth of the insert from the end of the tube. Use that measurement to mark the inside of the header tube. The insert depth should be held up slightly from the short-side radius at the lower bend and not bottom out (see image below). Measure the insert depth for every tube.
  4. Insert the muffler into one of the pipes of the header with the partially closed-off end first. DO NOT FORCE. The insert should be snug, but not too tight.
  5. There are various methods to secure the insert. Either drill a hole slightly in front of the insert and install a stove bolt and locknut (or use red Loctite); or drill and tap directly into the baffle ring, using a properly sized bolt with a small amount of red Loctite on the bolt threads
    1. NOTE: Some customers have used sheet metal or self-drilling/tapping screws to hold the mufflers in place, but such screws tend to vibrate loose.
  6. When the mufflers are securely fitted in all eight pipes, the headers are ready to install on the engine.

Zoomie Baffle Depth

Installation Notes

  1. The Patented Leak-Free Design on Sanderson Headers provides the only leak-free flange design on the market … Do Not Attempt To Use Flange Gaskets! The raised flange on tube-style Sanderson Headers will buckle the gasket during tightening and actually cause a leak!  It is only OK to use a header gasket on the cast-series header sets (QP1000 and QP2000) Click here for the header installation procedure.
  2. Sanderson Headers are NOT emissions legal on pollution-controlled motor vehicles. It is the purchaser’s responsibility to verify local regulations for compliance.
  3. Wrapping your Sanderson Headers with ANY thermal tape voids your header warranty. The best thermal protection for your headers is our Aluminized Ceramic Coating which is available for every Sanderson Header. For additional information on why using header wraps is a problem, please read this tech article by Century Performance Center which addresses thermal coatings and header wraps.

Header Warranty

Sanderson Header WarrantyLimited 5-Year General Warranty

Sanderson Street Rod Headers strives to supply our customers with the highest quality parts and services available in the street rod industry. In keeping with this, we warrant and will repair or replace, at our option after an inspection in our facility, any of our products that are found by us to have failed due to defects in either material or workmanship.  This warranty is activated by the return of the Warranty Card enclosed with every pair of headers and is effective for FIVE YEARS * from the date of purchase as indicated on the original invoice.

This Warranty does not cover products that fail due to improper motor tuning, alteration, disassembly, or damage caused by racing, misuse, neglect, abuse, improper installation, and/or accident, or when used on applications for which they were not designed or approved. We are specifically not responsible for the costs of removal, installation, transportation, destruction of other components, inconvenience, loss of time, or other personal damages, or for any other associated costs including the application of aftermarket coatings applied by others. Sanderson Street Rod Headers shall not be liable for any and all consequential damages occasioned by the breach of any written or implied warranty pertaining to this sale in excess of the purchase price of the product(s) as found on the original invoice.


* Extremely compact header designs that locate the collector in close proximity to the exhaust ports are very sensitive to engine tuning. Improper air/fuel mix or timing of ignition and/or valvetrain can cause early failure due to excessive heat. For this reason,  part numbers CC2 and CC3 are offered with a two-year warranty period only. This includes header sets that utilize one of these headers as part of the set (part numbers CC4 and CC14 for example). The compact header side will hold a 2-year warranty. All other Warranty conditions apply.

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