SKU: 3290507668

Flowtech LS Swap Exhaust Manifolds - 31730-3FLT

Sale price$172.32 Regular price$191.47
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  • USA
  • CAN

Ships within 48 hours · Estimated delivery Jul 20 - Jul 25

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Description

Flowtech LS Swap Exhaust Manifolds - 31730-3FLTOverview: These Flowtech cast iron exhaust manifolds have a 2. 25 inch outlet, natural cast finish and are designed to hug close to the engine block so they fit into a wide variety of replacement and engine swap applications at a budget friendly price. Being cast iron means they will provide years of leak free performance with less under hood noise than traditional headers. Plus, their shorty design means you can route exhaust tubing close to your

Overview:

These Flowtech cast iron exhaust manifolds have a 2.25 inch outlet, natural cast finish and are designed to hug close to the engine block so they fit into a wide variety of replacement and engine-swap applications at a budget friendly price. Being cast iron means they will provide years of leak-free performance with less under hood noise than traditional headers. Plus, their shorty design means you can route exhaust tubing close to your frame/floor pan for maximum ground clearance.

Features:

  • Intended for GM LS engine swap applications where durability and leak-free sealing is desired at a budget-oriented price
  • 304 stainless steel mating flanges included (mating flange fasteners are not included)
  • 2.25 inch outlet diameter offers improved flow for maximum performance from a cast iron exhaust manifold
  • 2 bolt exit flange configuration matches the E-rod exhaust manifolds for a factory like fitment. This allows the use of OE gaskets and fasteners if desired, for an OE quality seal and fitment to emissions devices
  • Cast from Hi-Silicon-Moly Ductile Iron to provide durability and corrosion resistance
  • Tight tuck design provides universal fit for most popular chassis and a clean traditional muscle car appearance
  • Available in plain as-cast finish or with black or silver ceramic coatings for reduced engine compartment temps and improved corrosion resistance

Application:

  • Universal

Specs:

Application Multi-fit
Brand Flowtech
Choose Your Part Manifold
Collector Diameter 2.25 inch
Emission Code 8
Engine GM LS
Finish Black Ceramic
Header Finish Black Ceramic
Header Style Manifold
Material Cast Iron
Primary Tube Dia. 1-3/4 inch
Product Type Manifold
Subframe Stock
Tube Material Cast Iron
Type of Component Manifold
Warning California Proposition 65
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 3290507668

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Verified Purchase
Amazon Customer Connie
Fort Morgan, US
★★★★★ 4
Very nice cart.
The cart is very functional and relatively easy to put together. I was also provided a great tip on the assembly that made it much easier.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 30, 2026
A
Verified Purchase
Anne Flynn
West Palm Beach, US
★★★★★ 5
Would definitely recommend.
Style: Grey Oak, Size: 14.17"D x 37.01"W x 35.24"H
Very nice product. Not that difficult to put together. I did it by myself just following the instructions exactly. Have gotten compliments from my friends. Fits a lot. Would definitely recommend. Nicely designed.
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Reviewed in the United States on March 12, 2026
R
Verified Purchase
Russell
Alexandria, US
★★★★★ 5
Pleasantly surprised!
The cart is super-sturdy, easy to assemble, and looks surprisingly nice. You would think that the “wood” (the rustic oak) on this cart would look hideous, but it’s not - and it looks good with the black metal. Just make sure you have your own tools, like a screw driver with a 4 mm hex bit or an impact driver or screw driver with a 4 mm hex bit; it would take way too long with the supplied hex wrench, which although a good quality, is just too slow to use.)
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Reviewed in the United States on November 22, 2025
T
Verified Purchase
Tom
Cuba, US
★★★★★ 5
Perfect
Style: Vintage Oak, Size: 14.17"D x 37.01"W x 35.24"H
Went together well Looks great
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Reviewed in the United States on May 4, 2026
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Verified Purchase
Charles T.
Los Angeles, US
★★★★★ 5
Recommended
The directions to build it were clear, and it was simple to put together alone. The wood and metal are good quality and the 3 shelves provide a lot of storage. I have no complaints.
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Reviewed in the United States on March 11, 2026

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