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 Aug 18 - Aug 23

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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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T. Hudson
Chelsea, US
★★★★★ 3
Beautiful watch, great packaging, but didn’t work.
Color: Silver, Size: 15MM
I love my ring watch so much that this is my second one (I washed my first one 😩). I ordered the ring on Wednesday and I got it Friday. I was so happy to get it, great packaging and fast delivery imagine how hurt I was when it didn’t work. I am gonna try to get a new battery and I pray that works but with the price being 80 plus dollars this should have never been a problem.
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Reviewed in the United States on April 26, 2026
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Heather Lynn Hawley
Bozeman, US
★★★★★ 4
Need more in different styles!
Color: Gold Glitz, Size: 15MM, Color: Gold Glitz, Size: 15MM
This ring watch is perfect! The face on it isn’t as big as all the other ring watches; which is why I chose it! I wanted something more dainty, as I have small fingers and hands. This ring is shiny, and the little crystals sparkle so nicely! The band doesn’t pinch, and I can wear it on multiple fingers. Easy to set and has kept time so far. Would recommend!
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Reviewed in the United States on March 3, 2026
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Savannah Hernandez
Lowell, US
★★★★★ 5
Very good Náutica Wallet
Color: J-Class - Black
Love it. It’s practical and comfortable
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Reviewed in the United States on March 6, 2026
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ASAF SALMAN
Louisville, US
★★★★★ 5
Great Product!
Color: Two Tone - Black/Grey
Very nice wallet, well designed to provide both functionality and durability (quality materials). It has enough storage space for cards and exchanges. Good value for money.
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Reviewed in the United States on February 21, 2025
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Carrie
Whiting, US
★★★★★ 5
My picky husband approves of it.
Color: Two Tone - Cobalt Blue
Nice quality. Fits the right amount of slots for cards. Not too big or bulky. The wallet is very nice with the built in anti theft to protect your personal information. The clip on the side makes it perfect for cash only transactions. It is a nice front pocket wallet. Came in a nice tin can as well. The blue on blue that I got is my favorite one. My picky Husband approves as he loves front pocket wallets.
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Reviewed in the United States on July 2, 2025

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