SKU: 3290507668

Flowtech LS Swap Exhaust Manifolds - 31730-3FLT

Sale price$172.32 Regular price$191.47
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Ships within 48 hours · Estimated delivery Aug 3 - Aug 8

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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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4.6 ★★★★★
Based on 9 reviews
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Eliza
Port Orchard, US
★★★★★ 5
Insanely great jeans for the price!
Special Size: Wide Leg Crop, Size: 12, Color: Medium Blue Vintage
I’m obsessed with these jeans. They’re comfortable and I think they legitimately look great. I had a baby 6 months ago and my body is “in transition” so I didn’t want to buy anything too expensive. These are cute, fit well, good quality. Excellent for short girls - I’m 5’ tall and they’re exactly the right length for a full-length jean. I feel like they’re fashionable without being too trendy (they work for 30somethings as well as 20somethings). They’re nice thick cotton with very little stretch. Because of that I’d be conservative with sizing because they do stretch significantly when you wear them. I got these in the lighter blue, too. The darker wash is slightly smaller and I wound up liking the color better, too. But the light wash is nice.
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Reviewed in the United States on November 16, 2025
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Lynn
Houston, US
★★★★★ 4
Excellant value
Special Size: Wide Leg Crop, Size: 14, Color: Rinse, Special Size: Wide Leg Crop, Size: 14, Color: Rinse
Purchased the “cropped” length. I am 5ft 3.5 inch. Weight 170lbs (42 inch hip/38 inch waist) normally wear a size 10/12 or 31 in jeans, depending on the brand. I ordered up at 14 for these based on other reviewers. (When held up to other jeans they were the same as a Talbots 10 at the waist) Prewash they felt good, a little big& length hit at the top of my foot. After wash and dry, the fit was almost perfect and the length was at lower ankle. Ordering up is probably the right choice, although I think I could have been comfortable in a 12 (with no drying). They are a tad bit too long for a “cropped” look IMO. The wide leg is a true wide leg and falls straight from the waist. The material is heavy and there is almost no give/stretch - so a traditional denim. This is the dark blue and it is a true dark blue. You can’t beat the price, excellent value.
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Reviewed in the United States on March 31, 2026
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MCC
Phoenix, US
★★★★★ 3
Be careful when washing!!!
Special Size: Wide Leg Crop, Size: 12, Color: Iced Blue Light Wash
Loved the jeans but after I washed them only after wearing one time, the color got completely stained. I washed on gentle with like colors and somehow the entire jeans turned splotchy. So upsetting because the fit and feel were great.
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Reviewed in the United States on January 3, 2026
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Annaliese Ramirez
San Leandro, US
★★★★★ 5
Great Jeans!!
Special Size: Wide Leg, Size: 8, Color: Stone Dark Wash
I love these wide leg jeans! The denim is thicker and more durable than I was expecting, especially for the price. These are a great quality! I get compliments on them every time I wear them and people are surprised when I tell them they're Amazon Basic brand. They fit true to size as I followed the size guide. From now on my jeans will be this brand!
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Reviewed in the United States on June 6, 2026
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laceyse
Boise, US
★★★★★ 5
Surprising good - great quality for price.
These are great for the price. They run a little wide in the waist so I sized down from an 8 to a 6 and they fit perfect. They are a true wide leg - so don’t buy if you are looking for something more straight leg or flair. The quality of the denim is very nice. I’m actually surprised and the quality. These do not feel stretchy which is good for the style. Very happy. Hopefully they hold up after washing
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Reviewed in the United States on January 24, 2026

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