SKU: 36662437862

Flowtech LS Swap Exhaust Manifolds - 31730-1FLT

Sale price$149.82 Regular price$166.47
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Shipping Estimate
USA
  • USA
  • CAN

Ships within 48 hours · Estimated delivery Sep 3 - Sep 8

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Description

Flowtech LS Swap Exhaust Manifolds - 31730-1FLTOverview: 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 Silver Ceramic
Header Finish Silver 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: 36662437862

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julia
Battle Creek, US
★★★★★ 1
Not for a agressive chewer
Size: Newspaper 4 PCS
To thin return
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Reviewed in the United States on January 29, 2026
K
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Kristen I
Waukegan, US
★★★★★ 5
Perfect for our purpose (Tricks)
Size: Newspaper 4 PCS
Perfect for tricks-related interactions (we have them inside a mailbox our dog opens… then he retrieves the news)
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Reviewed in the United States on December 14, 2025
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Tor
Lowell, US
★★★★★ 1
Beware of these crinkle plastic filler!
Size: Newspaper 4 PCS
3:09 handed to her.. 3:13 (4 minutes) taken away from her.. chewing on the plastic inner sheet filler... Not good gor medium to larger dogs! Nothing more than a thin satin pillow sheet with crinkle plastic paper inside that can choke your dog if not monitored!
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Reviewed in the United States on May 20, 2026
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Charlotte Phillips
Chelsea, US
★★★★★ 5
Dog toy
Size: Newspaper 4 PCS
Dog toys cute and love the paper
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Reviewed in the United States on September 17, 2025
J
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John B.
Bozeman, US
★★★★★ 1
Thin dog doesn't use it no filling its flat
Size: Poker 3 PCS
Suck suck suck
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Reviewed in the United States on June 1, 2026

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