GMC PM251 Headers and Exhaust Parts

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GMC PM251

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-33%

MagnaFlow |

#37611236

MagnaFlow 11236 4x9 Inch Oval Offset/Offset Stainless Muffler

Muffler Type:

Straight-Through

Inlet Diameter:

2.5"

Outlet Diameter:

2.5"

$130.00

/each

$196.64

-34%

MagnaFlow |

#37611256

MagnaFlow 11256 4x9 Inch Oval Center/Offset Stainless Muffler

Muffler Type:

Straight-Through

Inlet Diameter:

2.5"

Outlet Diameter:

2.5"

$146.00

/each

$221.39

-34%

MagnaFlow |

#37611266

MagnaFlow 11266 4x9 Inch Oval Offset/Offset Stainless Muffler

Muffler Type:

Straight-Through

Inlet Diameter:

2.5"

Outlet Diameter:

2.5"

$146.00

/each

$221.39

-34%

MagnaFlow |

#37612158

MagnaFlow 12158 5x8 Inch Oval Center/Dual Stainless Muffler

Muffler Type:

Straight-Through

Inlet Diameter:

2.5"

Outlet Diameter:

2.5"

$162.00

/each

$245.87

-34%

MagnaFlow |

#37612219

MagnaFlow 12219 5x8 Inch Oval Center/Center Stainless Muffler

Muffler Type:

Straight-Through

Inlet Diameter:

Outlet Diameter:

$146.00

/each

$221.39

Exhaust Manifolds VS Headers | How Much HP Do Headers Add

Headers and manifolds differ in design and function. Long tube headers, shorty headers, and exhaust manifolds each have their pros and cons regarding performance and application.

Exhaust System Header Wrapping

Whether you’re looking for performance improvements or heat reduction, if you decide to wrap your headers, we'll show you the benefits and possible precautions to take before you wrap your exhaust.

Tuning Tips after Header Installation

Making the switch from manifolds to headers is a popular performance upgrade, but it may take more than just bolting on the new part. We provide some tips and things to consider after you bolt on a new set of headers.

Tri-5 Headers with a Rack and Pinion System

In this Tech Tip, John explains the design behind a set of headers destined for a Tri-5 using a traditional rack and pinion style steering system.

Ceramic Coated Headers

Watch our video on the ceramic coating process for Armor Hot Coating. Headers coated with Armor Hot Coating protect your car without sacrificing looks.

Exhaust Repair

Some basic info on the various exhaust options carried by Speedway Motors.

Replacing GM Rear End Spherical Bushings

In this budget build, a GM rear end is upgraded in order to hold 400+ HP. See how spherical bushings are replaced in a used 8.5” GM 10 bolt rear end.

241 Hemi Long Block Rebuild Part One

Speedway Motors employee Tim M. has been chipping away steadily at his '29 roadster for awhile now. This time Tim tackles one of the big pieces, the long block rebuild of his 241 Red Ram Hemi.

241 Dodge Hemi Distributor Rebuild

Tim M. continues his quest to breathe life into a tired old 241 Dodge baby Hemi. This round, Tim dives into giving the 241 an electrifying makeover, courtesy of a Pertonix electronic ignition system, all cleverly hidden inside existing hardware.

-34%

MagnaFlow |

#37612468

MagnaFlow 12468 5 Inch x 8 Inch Oval Dual/Dual Stainless Muffler

Muffler Type:

Straight-Through

Inlet Diameter:

2.5"

Outlet Diameter:

2.5"

$187.00

/each

$283.98

-34%

MagnaFlow |

#37610748

MagnaFlow 10748 2.5x2 Inch Performance Stainless Straight Y-Pipe

Exhaust Tubing Diameter:

2-1/2 Inch

Inlet Diameter:

2.5"

Outlet Diameter:

$86.00

/each

$130.68

$105 Off

MagnaFlow |

#37612388

MagnaFlow 12388 5x8 Inch Oval Center/Dual Stainless Muffler

Muffler Type:

Straight-Through

Inlet Diameter:

Outlet Diameter:

2.5"

$201.00

/each

$305.94

-33%

MagnaFlow |

#37612616

MagnaFlow 12616 6x6 Inch Round Center/Center Stainless Muffler

Muffler Type:

Straight-Through

Inlet Diameter:

2.5"

Outlet Diameter:

2.5"

$130.00

/each

$196.64

-33%

MagnaFlow |

#37610160

MagnaFlow 10160 2 Inch Performance Exhaust Stainless Band Clamp

Exhaust Clamp Type:

Band

Inside Diameter:

$91.00

/set

$137.69

-34%

MagnaFlow |

#37612268

MagnaFlow 12268 5x8 Inch Oval Center/Dual Stainless Muffler

Muffler Type:

Straight-Through

Inlet Diameter:

2.5"

Outlet Diameter:

2.5"

$172.00

/each

$262.12

$109 Off

MagnaFlow |

#37612588

MagnaFlow 12588 5x11 Inch Oval Center/Dual Stainless Muffler

Muffler Type:

Straight-Through

Inlet Diameter:

Outlet Diameter:

2.5"

$209.00

/each

$318.22

-9%

Patriot Exhaust |

#447H6907

Patriot Exhaust H6907 304 Stainless Stee Exhaust Pipe, 1-5/8 Inch

Exhaust Tubing Diameter:

1-5/8 Inch

Exhaust Pipe Type:

Custom Tubing

Outside Diameter:

1.625"

$60.39

/each

$66.43

Hooker Headers |

#91602114

Hooker Headers LS Turbo Exhaust System Kit, TH350/400

(3)

Exhaust System Type:

Turbo-Back

Single or Dual:

Dual

Exhaust System Kit Type:

Direct Fit

$1,199.90

/kit

Hooker Headers |

#91602116

Hooker Headers LS Turbo Exhaust System Kit, 6L80/T56

(1)

Exhaust System Type:

Turbo-Back

Single or Dual:

Dual

Exhaust Tubing Diameter:

1-5/8 Inch

$1,269.90

/kit

Hooker Headers |

#91602117

Hooker Headers LS Turbo Exhaust System Kit, Universal

Exhaust System Type:

Turbo-Back

Single or Dual:

Dual

Exhaust Tubing Diameter:

1-5/8 Inch

$1,090.90

/kit

-10%

Borla |

#21540359

Borla® 40359 ProXS™ Muffler, 3 In Center In/Offset Out

(3)

Muffler Type:

Straight-Through

Inlet Diameter:

Outlet Diameter:

$128.99

/each

$143.99

$221 Off

Flowtech 31730-1FLT LS Swap Exhaust Manifolds, Silver Ceramic

Flowtech Exhaust |

#772317301FLT

Flowtech 31730-1FLT LS Swap Exhaust Manifolds, Silver Ceramic

(1)

Finish:

Ceramic Coated

Sold in Quantity:

Pair

$332.95

/kit

$553.95

-8%

Flowmaster |

#3788435409

Flowmaster 8435409 Delta Force 40 Series Race Muffler 3.50 In/Out

Muffler Type:

Chambered

Inlet Diameter:

3.5"

Outlet Diameter:

3.5"

$199.95

/each

$218.95

New Product

Netami NT2525X Stainless Steel 2.5" X 12" Dual X Exhaust Pipe

NETAMI Exhaust |

#21602525-2.5

Netami NT2525X Stainless Steel 2.5" X 12" Dual X Exhaust Pipe

Exhaust Tubing Diameter:

2-1/2 Inch

Finish:

Stainless

Sold in Quantity:

Each

$37.99

/each

-10%

Borla |

#21540349

Borla® 40349 ProXS™ Muffler, 3 Inch Inlet/2.5 Dual Out

Muffler Type:

Straight-Through

Inlet Diameter:

Outlet Diameter:

2.5"

$187.99

/each

$209.99

Combo Exhaust Pipe Mandrel Bend/Header Tubing, Mild Steel, 1-1/2"

Speedway Motors |

#91013870

Combo Exhaust Pipe Mandrel Bend/Header Tubing, Mild Steel, 1-1/2"

(81)

Exhaust Tubing Diameter:

1-1/2 Inch

Exhaust Pipe Type:

Header Tubing

Outside Diameter:

1.50"

$20.99

/each

Tight-Fit Small Block Chevy Block Hugger Headers, Chrome

Speedway Motors |

#9300101C

Tight-Fit Small Block Chevy Block Hugger Headers, Chrome

(9)

Header Tube Type:

Block Hugger

Exhaust Port Shape:

Oval

Flange Style:

Standard

$227.99

/pair

Assorted Mild Steel Header Tubing Pipe Mandrel Bends, 1-3/4 Inch

Speedway Motors |

#91013817

Assorted Mild Steel Header Tubing Pipe Mandrel Bends, 1-3/4 Inch

(20)

Exhaust Tubing Diameter:

1-3/4 Inch

Exhaust Pipe Type:

Header Tubing

Outside Diameter:

1.75"

$141.99

/set

Speedway Motors |

#91019981

Speedway Motors LS Swap V Band Cast Iron Exhaust Manifold LH

(4)

Material Type:

Cast Iron

Hardware Included:

Yes

as low as

$170.99

/each

3.5 Inch Dual Exhaust Mandrel Bend Tubing Kit, Mild Steel

Speedway Motors |

#91013821

3.5 Inch Dual Exhaust Mandrel Bend Tubing Kit, Mild Steel

(1)

Exhaust System Type:

Header-Back

Single or Dual:

Dual

Exhaust Tubing Diameter:

3-1/2 Inch

$233.99

/kit

Universal Dual Exhaust Mandrel X-Pipe Balance Tube Kit, 3 Inch

Speedway Motors |

#91013847

Universal Dual Exhaust Mandrel X-Pipe Balance Tube Kit, 3 Inch

(3)

Exhaust Tubing Diameter:

3 Inch

Finish:

Raw

Hardware Included:

Yes

$137.99

/kit

Speedway Motors |

#91013754

Header Reducer Kit, 3 to 2-1/2 Inch

(35)

Material Type:

Steel

Flange Style:

3-Bolt

$24.99

/pair

2.25 Inch Deluxe Dual Exhaust Pipe Tubing Kit, Mild Steel

Speedway Motors |

#9100653

2.25 Inch Deluxe Dual Exhaust Pipe Tubing Kit, Mild Steel

(4)

Exhaust System Type:

Header-Back

Single or Dual:

Dual

Exhaust Tubing Diameter:

2-1/4 Inch

$182.99

/kit

216, 235, 261 Chevy 6 Cylinder Headers, Raw Finish

Speedway Motors |

#9301213

216, 235, 261 Chevy 6 Cylinder Headers, Raw Finish

(9)

Header Tube Type:

Shorty

Flange Style:

Standard

Primary Tube Diameter:

1-3/4"

$198.99

/set

Stainless Steel Chamber Muffler, 3 Inch, Centered/Centered

Speedway Motors |

#9302009

Stainless Steel Chamber Muffler, 3 Inch, Centered/Centered

(1)

Muffler Type:

Chambered

Inlet Diameter:

Outlet Diameter:

$97.99

/each

Boom Tube Small Block Chevy Zoomie Headers for Sprint, Raw Finish

Speedway Motors |

#9301700

Boom Tube Small Block Chevy Zoomie Headers for Sprint, Raw Finish

(32)

Header Tube Type:

Zoomie

Flange Style:

Standard

Primary Tube Diameter:

1-3/4"

$171.99

/pair

Big Block Chevy, Block Hugger, Tight-Fit Headers, AHC Coated

Speedway Motors |

#9300102H

Big Block Chevy, Block Hugger, Tight-Fit Headers, AHC Coated

(4)

Header Tube Type:

Block Hugger

Exhaust Port Shape:

Round

Flange Style:

Standard

$374.99

/pair

Speedway Motors |

#91019980

Speedway Motors LS Swap Cast Iron V Band Exhaust Manifold, RH

(1)

Material Type:

Cast Iron

Hardware Included:

Yes

as low as

$168.99

/each

Speedway 80" Chrome Plated Lake Exhaust Pipes & Mounting Brackets

Speedway Motors |

#9100700

Speedway 80" Chrome Plated Lake Exhaust Pipes & Mounting Brackets

Exhaust Tubing Diameter:

2 Inch

Finish:

Chrome

Overall Length:

80.00"

$305.99

/kit

Quick Release V-Band Exhaust Clamp/Flange, Stainless, 3.00 Inch

Speedway Motors |

#91013019

Quick Release V-Band Exhaust Clamp/Flange, Stainless, 3.00 Inch

Exhaust Clamp Type:

Quick Release V-Band

Inside Diameter:

Sold in Quantity:

Each

$29.99

/each

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GMC PM251 Headers and Exhaust Parts

Year

Subcategory

Part

Brand

Transmission Family

Availability

Engine Family

Discounts

Price

Customer Rating

Products

MagnaFlow 11236 4x9 Inch Oval Offset/Offset Stainless Muffler

MagnaFlow 11256 4x9 Inch Oval Center/Offset Stainless Muffler

MagnaFlow 11266 4x9 Inch Oval Offset/Offset Stainless Muffler

MagnaFlow 12158 5x8 Inch Oval Center/Dual Stainless Muffler

MagnaFlow 12219 5x8 Inch Oval Center/Center Stainless Muffler

Related Articles

MagnaFlow 12468 5 Inch x 8 Inch Oval Dual/Dual Stainless Muffler

MagnaFlow 10748 2.5x2 Inch Performance Stainless Straight Y-Pipe

MagnaFlow 12388 5x8 Inch Oval Center/Dual Stainless Muffler

MagnaFlow 12616 6x6 Inch Round Center/Center Stainless Muffler

MagnaFlow 10160 2 Inch Performance Exhaust Stainless Band Clamp

MagnaFlow 12268 5x8 Inch Oval Center/Dual Stainless Muffler

MagnaFlow 12588 5x11 Inch Oval Center/Dual Stainless Muffler

Patriot Exhaust H6907 304 Stainless Stee Exhaust Pipe, 1-5/8 Inch

Hooker Headers LS Turbo Exhaust System Kit, TH350/400

Hooker Headers LS Turbo Exhaust System Kit, 6L80/T56

Hooker Headers LS Turbo Exhaust System Kit, Universal

Borla® 40359 ProXS™ Muffler, 3 In Center In/Offset Out

Flowtech 31730-1FLT LS Swap Exhaust Manifolds, Silver Ceramic

Flowmaster 8435409 Delta Force 40 Series Race Muffler 3.50 In/Out

Netami NT2525X Stainless Steel 2.5" X 12" Dual X Exhaust Pipe

Borla® 40349 ProXS™ Muffler, 3 Inch Inlet/2.5 Dual Out

Combo Exhaust Pipe Mandrel Bend/Header Tubing, Mild Steel, 1-1/2"

Tight-Fit Small Block Chevy Block Hugger Headers, Chrome

Assorted Mild Steel Header Tubing Pipe Mandrel Bends, 1-3/4 Inch

Speedway Motors LS Swap V Band Cast Iron Exhaust Manifold LH

3.5 Inch Dual Exhaust Mandrel Bend Tubing Kit, Mild Steel

Universal Dual Exhaust Mandrel X-Pipe Balance Tube Kit, 3 Inch

Header Reducer Kit, 3 to 2-1/2 Inch

2.25 Inch Deluxe Dual Exhaust Pipe Tubing Kit, Mild Steel

216, 235, 261 Chevy 6 Cylinder Headers, Raw Finish

Stainless Steel Chamber Muffler, 3 Inch, Centered/Centered

Boom Tube Small Block Chevy Zoomie Headers for Sprint, Raw Finish

Big Block Chevy, Block Hugger, Tight-Fit Headers, AHC Coated

Speedway Motors LS Swap Cast Iron V Band Exhaust Manifold, RH

Speedway 80" Chrome Plated Lake Exhaust Pipes & Mounting Brackets

Quick Release V-Band Exhaust Clamp/Flange, Stainless, 3.00 Inch