SKU: 3572181610

Flowtech LS Swap Exhaust Manifolds - 31730-1FLT

Sale price$149.82 Regular price$166.47
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  • USA
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Ships within 48 hours · Estimated delivery Jul 16 - Jul 21

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For Your Every Summer RSVP, with Code: SUMMER15

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: 3572181610

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4.1 ★★★★★
Based on 16 reviews
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Coffee and Cats
Alexandria, US
★★★★★ 5
Love the fit!
Love the fit and feel of this tank. Feels casual yet classic. I wish it came in more color/print options. A red stripe or a green stripe would awesome! I am 5'1" and 165 (large chest) and a large fit perfect!
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Reviewed in the United States on May 1, 2026
R
Verified Purchase
Rawrr
Battle Creek, US
★★★★★ 3
Love the print, but didn't like the style...
Size: Small, Color: Dark Camel Leopard
I'm 5'5 114lbs 34B and got the "camel" leopard print in size small. I think it's technically a cute shirt and it fits okay, I guess, but the style and color ended up looking terrible on me! For reference, the size small measures 21 inches long (from the center of the front collar to the bottom), and about 18 inches wide. I find the style really unflattering on me. The color seemed like it would be flattering for most skin tones, but it ended up making my yellowish skin tone (I'm half asian) look sickly. Also note that this shirt is made of rayon, which is sensitive to heat, so if you get it (and you like it) you should keep it out of hot water and avoid putting it in the dryer if you don't want it to shrink. As for the fit, I usually wear size small unless I want my shirt to fit oversized or flowy etc, so I got this in small. It fits loose enough to be comfortable, but this type of collar is so unflattering on me (I could deal if it was either higher or lower) and the curved hem and in-between length just doesn't suit my body type. LOL, apparently, the fact that it has a cool print still doesn't change the fact that the "muscle" tee style looks terrible on me. It might suit someone else though. The fabric is stretchy and soft, but it's not clingy or see thru (might be in other colors though). The armholes also don't gape at all (doesn't show any of my bra). I ended up having to return it.
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Reviewed in the United States on June 23, 2022
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Verified Purchase
Trizian Lacson - Canoza
Belleville, US
★★★★★ 5
Comfy
Very comfortable clothes and it fits me just quite right.
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Reviewed in the United States on June 11, 2026
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Verified Purchase
Meagan Hendrix
Belleville, US
★★★★★ 5
Perfect Summer Tank!
Size: X-Large, Color: Black
I recently added the Amazon Essentials Relaxed Fit Sleeveless T-Shirt to my everyday wardrobe, and I’ve been pleasantly surprised by how versatile and comfortable it is. Fit & Comfort: True to its name, the relaxed fit is roomy without looking baggy. It’s ideal for casual wear, working out, or layering under jackets and cardigans. The sleeveless cut offers great freedom of movement, and the armholes are well-designed—not too tight and not too loose. It’s flattering on different body types and long enough to cover the waistband comfortably. Fabric Quality: The cotton blend is soft, breathable, and holds up well in the wash. It’s not too thin or see-through, which I appreciate. It also doesn’t cling, making it perfect for hot days or light workouts. Style & Versatility: The design is simple but stylish—easy to pair with leggings, shorts, or jeans. Available in multiple colors, so it’s easy to stock up for mix-and-match options. Price Point: Great value for the price. It's budget-friendly without feeling cheap, and it performs just as well as more expensive basics from other brands. Minor Cons: Some lighter colors may show sweat slightly more. If you prefer a more fitted look, you may want to size down. Final Verdict: The Amazon Essentials Relaxed Fit Sleeveless T-Shirt is a solid everyday staple—comfortable, affordable, and stylish in a low-key way. Whether you're lounging, running errands, or hitting the gym, this tee gets the job done.
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Reviewed in the United States on June 12, 2025
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Verified Purchase
Rebecca Madureira
Whiting, US
★★★★★ 5
Nice
Size: Large, Color: Forest Green
These are really nice very soft and a great value for the price! Runs true to size Only issue for me would be the armpits are a bit large. But the colors are beautiful also
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Reviewed in the United States on March 4, 2026

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