Product Summary

Long Tube Header Tube Type, D-port Exhaust Port Shape

  • Flowtech headers offer the perfect combination of performance and value
  • They are precision engineered using mandrel bent tubing
  • Features 5/16" flanges with sealing rings for a leak-free seal
  • All mounting hardware and gaskets are included for a simple installation
  • Made from durable steel with a silver ceramic coating for added protection

Rebates Available

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Key Specs

MFG. Part #31170FLT
Header Tube TypeLong Tube
Exhaust Port ShapeD-port
Flange StyleStandard
Primary Tube Diameter1-5/8"
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Need To Know

Quick and Easy Returns

Return Policy

Flowtech Exhaust 31170FLT Details

Flowtech headers are the perfect combination of performance and value. Flowtech long tube headers are precision engineered using mandrel bent tubing, formed collectors and 5/16" flanges with sealing rings for a leak-free seal. All mounting hardware and gaskets are included for a simple installation. This header is coated in a high heat and corrosion resistant metallic ceramic thermal coating that increases exhaust velocity and reduces underhood temps for increased performance.

  • Fuel Economy From The Engine
  • Leak Test For Max Performance
  • Ceramic Headers
  • Rust And Corrosion Resistance
  • Mandrel-Formed Power Plenum
  • Leakproof O-Ringed Port Seals
  • Include All Mounting Hardware

Application

1964 Pontiac GTO
1964 Pontiac LeMans
1965 Pontiac GTO
1965 Pontiac LeMans
1966 Pontiac GTO
1966 Pontiac LeMans
1967 Pontiac LeMans
1968 Pontiac GTO
1968 Pontiac LeMans
1969 Pontiac GTO
1969 Pontiac LeMans
1970 Pontiac Firebird
1970 Pontiac GTO
1970 Pontiac LeMans
1971 Pontiac Firebird
1971 Pontiac GTO
1971 Pontiac LeMans
1972 Pontiac Firebird
1972 Pontiac GTO
1972 Pontiac LeMans
1973 Pontiac Firebird
1973 Pontiac Grand Am
1973 Pontiac GTO
1973 Pontiac LeMans
1974 Pontiac Firebird
1974 Pontiac Grand Am
1974 Pontiac LeMans
1975 Pontiac Firebird
1975 Pontiac Grand Am
1975 Pontiac LeMans
1976 Pontiac Firebird
1977 Pontiac Firebird
1978 Pontiac Firebird
1979 Pontiac Firebird

Charts

Rebates

Holley October Promo 10% Off Select Parts Sale

Holley October Promo 10% Off Select Parts SaleHolleyOctoberPromo10%OffSelectPartsSale

Holley's October Promo 10% Off Select Parts Sale, running from September 28, 2026, through November 1, 2026. For a limited time, customers can save up to 10% off on select Holley parts, making it the perfect opportunity to upgrade your ride with premium Holley branded parts including Holley, Brawler, Quick Fuel, Leg Wheels, Rev Wheels, Rocket Racing, Flowtech, Edge, Racequip, Apr and Dinan. Purchases must be made between September 28, 2026, through November 1, 2026. This limited-time offer applies to qualifying Holley branded parts purchased during the promotional period. Following the promotion, these parts will revert back to standard pricing.

CARB Warning

For race/ off road use only

Emissions warning: this part only legal for sale or use in California for racing (competition) vehicles which may never be used, registered, or licensed for use upon a public highway. Any other use renders the vehicle tampered and not legal for use on California public highways (any public street or roadway, public dirt road, public park, or publicly maintained right of way open to the use of the public for vehicular travel). Violations subject to $37,500 penalty per violation per vehicle, revocation of registration, loss of use on California public right of ways, and proof of correction for tampering. There are similar restrictions and penalties under federal law and the laws of all other states with penalties under federal law of up to approximately $45,268 per tampered vehicle and/or engine.

Flowtech Exhaust 31170FLT Specifications

KEY SPECS
MFG. Part #31170FLT
BrandFlowtech Exhaust
Header Tube TypeLong Tube
Exhaust Port ShapeD-port
Flange StyleStandard
Primary Tube Diameter1-5/8"
Material TypeSteel
ColorSilver
Weld-UpNo
Collector Diameter3 Inch
FinishCeramic Coated
Hardware IncludedYes
Gasket(s) IncludedYes
Collector Reducers IncludedYes
Collector Reducer Exit Diameter2.5"
Collector Attachment Type3-bolt flange
GENERAL
Sold in QuantityPair
GTIN Code787480311702
Emission Code3

Questions & Answers

Fitment

  • 389 Pontiac V8

  • 389 Pontiac V8

  • 389 Pontiac V8

  • 389 Pontiac V8

  • 389 Pontiac V8

  • 389 Pontiac V8

  • 389 Pontiac V8

  • 389 Pontiac V8

Customer Impersonation Script