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GMC C- And K- Series Pick-up Doug Thorley Headers 

When you own GMC C- and K- Series Pick-up Doug Thorley headers, you own a piece of history! Doug Thorley has been making headers since 1958, so it's safe to say that they know what they're doing when it comes to finding the horsepower hidden in your ride's exhaust. Amazing attention to detail and real craftsmanship are just two reasons you'll love your new GMC C- and K- Series Pick-up Doug Thorley headers!


 Select Your Vehicle

Shop GMC C- And K- Series Pick-up Doug Thorley Headers by Year


1 - 12 of 12
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Fits: 1973-89 GM Motorhome "A"/ Pick Up

PART# THY-303Y-DA-C

Tube Grouping: 4-2-1
Finish: Ceramic Coated
Retail: $2,266.04
$1,971.45


Free Shipping!


Fits: 1973-87 GM Pick Up

PART# THY-364Y-C

Finish: Ceramic Coated
Retail: $2,117.69
$1,842.39


Free Shipping!


Fits: 1973-87 GM Pick Up

PART# THY-364Y-DA-C

Finish: Ceramic Coated
Retail: $1,422.92
$1,237.94


Free Shipping!


Fits: 1961-87 GM Pick Up

PART# THY-300Y-DA-C

Tube Grouping: 4-2-1
Finish: Ceramic Coated
Retail: $2,123.52
$1,847.46


Free Shipping!


Fits: 1973-87 GM Pick Up

PART# THY-364Y-S-C

Tube Grouping: 4-1
Finish: Ceramic Coated
Retail: $1,483.98
$1,291.06


Free Shipping!



Fits: 1973-89 GM Pick Up 4WD

PART# THY-304Y-S-C

Tube Grouping: 4-2-1
Finish: Ceramic Coated
Retail: $2,228.24
$1,938.57


Free Shipping!


Fits: 1967-72 GM Pick Up

PART# THY-372Y-C

Finish: Ceramic Coated
Header Style: Long Tube
Retail: $2,100.25
$1,827.22


Free Shipping!


Fits: 1961-87 GM Pick Up

PART# THY-300Y-S-C

Tube Grouping: 4-2-1
Finish: Ceramic Coated
Retail: $2,318.43
$2,017.03


Free Shipping!


Fits: 1973-89 GM Motorhome "A"/ Pick Up

PART# THY-303Y-C

Tube Grouping: 4-2-1
Finish: Ceramic Coated
Retail: $2,100.25
$1,827.22


Free Shipping!


Fits: 1961-87 GM Pick Up

PART# THY-300Y-C

Finish: Ceramic Coated
Header Style: Long Tube
Retail: $2,062.41
$1,794.30


Free Shipping!


Fits: 1973-89 GM Motorhome "A"/ Pick Up

PART# THY-303Y-S-C

Tube Grouping: 4-2-1
Finish: Ceramic Coated
Retail: $2,248.59
$1,956.27


Free Shipping!


Fits: 1973-89 GM Pick Up 4WD

PART# THY-304Y-C

Tube Grouping: 4-2-1
Finish: Ceramic Coated
Retail: $2,094.41
$1,822.14


Free Shipping!


Previous1Next

When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.

Not able to find what you are looking for?

91831FLT Flowtech Headers for Chevy Suburban GMC C1500 C2500 Truck K1500 K2500

49150FLT Flowtech Headers for Chevy Suburban Chevrolet C10 GMC C35/C3500 Pickup







GMC C- And K- Series Pick-up Doug Thorley Headers 

When you own GMC C- and K- Series Pick-up Doug Thorley headers, you own a piece of history! Doug Thorley has been making headers since 1958, so it's safe to say that they know what they're doing when it comes to finding the horsepower hidden in your ride's exhaust. Amazing attention to detail and real craftsmanship are just two reasons you'll love your new GMC C- and K- Series Pick-up Doug Thorley headers!


Choose Your Vehicle:

Shop GMC C- And K- Series Pick-up Doug Thorley Headers by Year

1 - 12 of 12
Sort by:




Fits: 1973-89 GM Motorhome "A"/ Pick Up

PART# THY-303Y-DA-C

Tube Grouping: 4-2-1
Finish: Ceramic Coated
Retail: $2,266.04
$1,971.45


Free Shipping!


Fits: 1973-87 GM Pick Up

PART# THY-364Y-C

Finish: Ceramic Coated
Retail: $2,117.69
$1,842.39


Free Shipping!


Fits: 1973-87 GM Pick Up

PART# THY-364Y-DA-C

Finish: Ceramic Coated
Retail: $1,422.92
$1,237.94


Free Shipping!


Fits: 1961-87 GM Pick Up

PART# THY-300Y-DA-C

Tube Grouping: 4-2-1
Finish: Ceramic Coated
Retail: $2,123.52
$1,847.46


Free Shipping!


Fits: 1973-87 GM Pick Up

PART# THY-364Y-S-C

Tube Grouping: 4-1
Finish: Ceramic Coated
Retail: $1,483.98
$1,291.06


Free Shipping!


Fits: 1973-89 GM Pick Up 4WD

PART# THY-304Y-S-C

Tube Grouping: 4-2-1
Finish: Ceramic Coated
Retail: $2,228.24
$1,938.57


Free Shipping!


Fits: 1967-72 GM Pick Up

PART# THY-372Y-C

Finish: Ceramic Coated
Header Style: Long Tube
Retail: $2,100.25
$1,827.22


Free Shipping!


Fits: 1961-87 GM Pick Up

PART# THY-300Y-S-C

Tube Grouping: 4-2-1
Finish: Ceramic Coated
Retail: $2,318.43
$2,017.03


Free Shipping!


Fits: 1973-89 GM Motorhome "A"/ Pick Up

PART# THY-303Y-C

Tube Grouping: 4-2-1
Finish: Ceramic Coated
Retail: $2,100.25
$1,827.22


Free Shipping!


Fits: 1961-87 GM Pick Up

PART# THY-300Y-C

Finish: Ceramic Coated
Header Style: Long Tube
Retail: $2,062.41
$1,794.30


Free Shipping!


Fits: 1973-89 GM Motorhome "A"/ Pick Up

PART# THY-303Y-S-C

Tube Grouping: 4-2-1
Finish: Ceramic Coated
Retail: $2,248.59
$1,956.27


Free Shipping!


Fits: 1973-89 GM Pick Up 4WD

PART# THY-304Y-C

Tube Grouping: 4-2-1
Finish: Ceramic Coated
Retail: $2,094.41
$1,822.14


Free Shipping!


Previous1Next

When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.

Not able to find what you are looking for?

91831FLT Flowtech Headers for Chevy Suburban GMC C1500 C2500 Truck K1500 K2500

49150FLT Flowtech Headers for Chevy Suburban Chevrolet C10 GMC C35/C3500 Pickup