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Description
Flowtech Upright Headers - 11545FLTOverview: Flowtech Headers are the perfect combination of quality and value. These Small Block Chevy Upright headers available in 1 5 8" and 1 3 4" tube diameters are ideal for even big cubic inch Small Block Chevy engines. They feature a merged collector coupled with a collector spear that is welded inside the collector. These components help to improve the flow and performance of the header. Features: CNC Mandrel bent tubes provide consistent tubing
Overview:
Flowtech Headers are the perfect combination of quality and value. These Small Block Chevy Upright headers available in 1-5/8" and 1-3/4" tube diameters are ideal for even big cubic inch Small Block Chevy engines.
They feature a merged collector coupled with a collector spear that is welded inside the collector. These components help to improve the flow and performance of the header.
Features:
- CNC Mandrel-bent tubes provide consistent tubing diameters for smooth flow and increases the cylinder scavenging effect and improves engine breathing
- Heavy duty 16-gauge 409SS tubing for increased strength and durability
- 1-5/8” and 1-3/4” tubing diameters available for increased exhaust flow increasing performance and improved throttle response
- 3” collector for maximum strength and exhaust flow
- Extra thick header flange for a leak-free seal and maximum strength
- Welded-in collector merge spears to control exhaust gas re-entry into primary tubes
Application:
- 1955-1986 Chevrolet Corvette
- 1959-1986 Chevrolet El Camino
- 1959-1986 Pontiac Parisienne
- 1958-1985 Chevrolet Impala
- 1955-1981 Chevrolet Bel Air
- 1955-1981 Pontiac Laurentian
- 1966-1986 Chevrolet Caprice
- 1967-1986 Chevrolet C10 Suburban
- 1967-1986 Chevrolet K10 Suburban
- 1967-1986 Chevrolet K20 Suburban
- 1967-1986 Chevrolet Camaro
- 1967-1986 Chevrolet C20 Suburban
- 1964-1983 Chevrolet Malibu
- 1968-1986 Pontiac Firebird
- 1970-1986 Chevrolet Monte Carlo
- 1970-1986 GMC Jimmy
- 1971-1986 Pontiac Bonneville
- 1960-1974 Chevrolet C20 Pickup
- 1960-1974 Chevrolet C10 Pickup
- 1960-1974 Chevrolet C30 Pickup
- 1960-1974 Chevrolet K10 Pickup
- 1960-1974 Chevrolet K20 Pickup
- 1958-1972 Chevrolet Brookwood
- 1958-1972 Chevrolet Biscayne
- 1968-1981 Pontiac LeMans
- 1959-1972 Chevrolet Kingswood
- 1958-1970 Pontiac Strato-Chief
- 1975-1986 Chevrolet C10
- 1975-1986 Chevrolet K5 Blazer
- 1975-1986 Chevrolet K20
- 1975-1986 Chevrolet C20
- 1975-1986 Chevrolet C30
- 1975-1986 Chevrolet G20
- 1975-1986 Chevrolet G30
- 1975-1986 Pontiac Grand Prix
- 1970-1981 Pontiac Catalina
- 1975-1986 Chevrolet G10
- 1975-1986 Chevrolet K10
- 1969-1979 Chevrolet Nova
- 1977-1986 Buick Regal
- 1964-1973 Chevrolet Chevelle
- 1977-1986 Chevrolet K30
- 1978-1986 Oldsmobile Cutlass
- 1975-1983 Pontiac Grand LeMans
- 1978-1986 Oldsmobile Cutlass Supreme
- 1978-1986 GMC Caballero
- 1967-1974 GMC C15/C1500 Pickup
- 1979-1986 GMC G1500
- 1979-1986 GMC G2500
- 1964-1971 Pontiac Acadian
- 1967-1974 GMC K25/K2500 Suburban
- 1967-1974 GMC C15/C1500 Suburban
- 1967-1974 GMC C25/C2500 Suburban
- 1967-1974 GMC K15/K1500 Suburban
- 1967-1974 GMC K25/K2500 Pickup
- 1979-1986 GMC K1500
- 1979-1986 GMC K1500 Suburban
- 1967-1974 GMC C25/C2500 Pickup
- 1967-1974 GMC K15/K1500 Pickup
- 1967-1974 Chevrolet G20 Van
- 1967-1974 GMC C35/C3500 Pickup
- 1979-1986 GMC K2500
- 1979-1986 GMC K2500 Suburban
- 1967-1974 GMC G15/G1500 Van
- 1967-1974 GMC G25/G2500 Van
- 1979-1986 GMC K3500
- 1979-1986 GMC C2500
- 1979-1986 GMC C2500 Suburban
- 1979-1986 GMC C3500
- 1979-1986 GMC C1500
- 1973-1980 Pontiac Grand Am
- 1979-1986 GMC C1500 Suburban
- 1975-1982 Oldsmobile Delta 88
- 1979-1986 GMC G3500
- 1960-1966 Chevrolet Suburban
- 1968-1974 Chevrolet G10 Van
- 1971-1977 Pontiac Ventura
- 1955-1961 Chevrolet Nomad
- 1960-1966 GMC 3000
- 1960-1966 GMC 3500
- 1968-1974 Chevrolet K30 Pickup
- 1971-1977 GMC Sprint
- 1978-1984 Oldsmobile Cutlass Calais
- 1968-1974 GMC K35/K3500 Pickup
- 1963-1968 Chevrolet Chevy II
- 1955-1960 Chevrolet Truck
- 1955-1960 GMC Truck
- 1964-1969 Pontiac Beaumont
- 1969-1974 Chevrolet Blazer
- 1960-1965 GMC Suburban
- 1977-1981 Buick Century
- 1978-1982 Buick LeSabre
- 1970-1974 GMC G35/G3500 Van
- 1970-1974 Chevrolet G30 Van
- 1955-1959 GMC 250
- 1955-1959 GMC 300
- 1955-1959 GMC 350-8
- 1955-1959 GMC 370
- 1955-1959 GMC F350
- 1955-1959 GMC F370
- 1955-1959 GMC FM340
- 1955-1959 GMC 100
- 1955-1959 GMC 150
- 1955-1959 GMC FM350
- 1955-1959 GMC M300
- 1955-1959 GMC PM150
- 1955-1959 GMC PM250
- 1955-1959 GMC S300
- 1955-1959 GMC S370
- 1975-1979 Chevrolet Monza
- 1969-1972 Chevrolet Townsman
- 1960-1963 GMC 1000 Series
- 1960-1963 GMC 1500 Series
- 1960-1963 GMC 2500 Series
- 1975-1978 GMC G15
- 1975-1978 GMC G25
- 1975-1978 GMC G35
- 1956-1959 GMC PM151
- 1956-1959 GMC PM251
- 1955-1958 Pontiac Pathfinder
- 1955-1958 Chevrolet Sedan Delivery
- 1975-1978 GMC K15
- 1975-1978 GMC K15 Suburban
- 1975-1978 GMC K25
- 1973-1976 Chevrolet Laguna
- 1972-1975 Pontiac Grandville
- 1975-1978 GMC K25 Suburban
- 1980-1983 Oldsmobile Cutlass Cruiser
- 1975-1978 GMC C25
- 1975-1978 GMC C25 Suburban
- 1975-1978 GMC C35
- 1975-1978 GMC C15
- 1975-1978 GMC C15 Suburban
- 1971-1974 Pontiac Grand Safari
- 1955-1957 Chevrolet One-Fifty Series
- 1972-1974 Chevrolet P30 Van
- 1955-1957 Chevrolet Two-Ten Series
- 1977-1979 Buick Skylark
- 1968-1970 Pontiac Tempest
- 1957-1959 GMC PM152
- 1957-1959 GMC PM153
- 1959-1961 Chevrolet Parkwood
- 1977-1979 Pontiac Phoenix
- 1975-1977 Oldsmobile Custom Cruiser
- 1978-1980 Oldsmobile Cutlass Salon
- 1977-1979 Oldsmobile Omega
- 1977-1979 Oldsmobile Starfire
- 1969-1970 Chevrolet Estate
- 1957-1958 Chevrolet Del Ray
- 1978-1979 Pontiac Sunbird
- 1955-1956 GMC M340
- 1977-1978 GMC K35
- 1958 GMC PM252
- 1958 GMC PM253
- 1958 Chevrolet Yeoman
- 1959 Chevrolet 3B
- 1959 Chevrolet 3C
- 1959 Chevrolet 3D
- 1959 Chevrolet 3E
- 1959 Chevrolet 3F
- 1959 Chevrolet 3G
- 1967 Chevrolet K20 Panel
- 1955 GMC 100-22
- 1955 GMC 150-22
- 1955 GMC 250-22
- 1955 GMC 280-22
Specs:
| Application | Small Block Chevy |
|---|---|
| Brand | Flowtech |
| Collector Diameter | 3.00 inch |
| Collector Length | 12 inch |
| Emission Code | 4 |
| Engine | Chevrolet Small Block |
| Header Finish | Natural |
| Header Style | Upright |
| Installed Height | 37.0" |
| Primary Tube Dia. | 1-5/8 inch |
| Product Type | Headers |
| Tube Material | 409 Stainless Steel |
| 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:
- 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
4.1 ★★★★★
Based on 27 reviews
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Product Reviews
★★★★★ 5
Holy S*** this bra is amazing.
Color: Black, Size: 42G
I’m sure you are coming here reading reviews thinking “I don’t know. No bra has ever fit me right before. How will I know this bra is any different?” And let me be the first to tell you I was right there with you. I have been bra shopping for what feels like forever. For context I am a G cup and finding bras that fit nice seems like something I’d only find in my dreams. I have gotten bras from Torrid, Victoria Secret, Lane Bryant, Kohls, Walmart, you get the idea. Yes I know there are plenty of other sites but I don’t want to spend $80+ for a bra! Between them either hurting like hell from the wire, feeling like I was wearing a corset that was made for a door, or having absolutely no support/coverage, I contemplated just wearing no bra at all. I had such “luck” that I thought “maybe if I wear a sports bra all the time these problems would go away.” You guessed it! They in fact did not. I even tried no underwire and sure the wire pain was gone but good ol back pain came in at full swing. I would have constant issues with spillage and not feeling supported (and DONT even get me started on the uniboob)that I began to think I was the problem. Fortunately, a couple of days ago, I had discovered HSIA. I can’t stress enough to you how wonderful this bra is. It’s not only supportive but it’s also comfortable, breathable, and full coverage. And a added bonus: IT LOOKS AMAZING. This bra has changed my depressive outlook on bras to the most positive outlook. So much so I’m wearing this bra FOR FUN. 10/10 would recommend. It fits true to size. Straps are comfortable, no pinching. Under wire is very comfortable and does not dig into my rib cage. There is no padding, but still feels/looks great. Some shirts you can see the lace material but they have another bra that is smooth (I bought that one too) that fits just as great. I personally did not experience any itching like some other people were saying but I’d say just give it a try. If you made it this far reading this just buy it and see for yourself :)
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Reviewed in the United States on October 25, 2025
★★★★★ 4
Delicate and pretty but does the job
Color: Light Coral, Size: 40DDD
This is a new brand of bra for me and I got it because it was recommended. Today I'm wearing it and have a few thoughts:
1) The straps are comfortable. In fact, the whole thing is comfortable. It doesn't look like it would be comfortable at all, but it's pretty nice.
2) I'm not so sure about the sturdiness. When putting this on this morning, the mesh actually ripped a little bit as I was positioning it around my torso after buckling the back together. This is how I put bras on: Turn it upside down and have the snaps facing the front, snap the snaps, then rotate it around your torso until it's positioned correctly, then flip it rightside up over your breasts. Is there some other way? I'm super afraid of ripping the delicate material now.
3) Despite how delicate the material is, it does have some give once on and holds my breasts well.
4) The fit is good. I'm normally a 40DDD. If I go up a cup size, then the underwire digs into my skin, so I want to avoid that. These seem a bit snug so as I wear it today, I'm going to watch for "spillage" where breasts start bunching up at the top. I know, that sounds so gross, but larger breasted ladies know what I mean!
To answer some questions:
Yes, it has adjustable straps. Are there bras that don't have adjustable straps that aren't sports bras?
Yes, it is machine washable, though this is one of the first bras where I think I might actually need to use a delicates bag because the lace is just so delicate.
It's very pretty, holds well, minimizes well, is pretty comfortable, but just a lot more delicate than I'm used to.
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Reviewed in the United States on August 22, 2025
★★★★★ 5
Great affordable bra
Color: Balsam Blue, Size: 38I
Best bra I have purchased! I wear a 38 I and this is without a doubt the comfiest bra I own. No side boob or uniboob! The fit is perfect and there is no spillage on the tops or sides and I'm not having to constantly adjust myself. I didn't think it was possible to find cute, supportive bra for under $40 but here we are. They also have great support for when I'm at the gym. I do tend to still put a looser fitting sports bra over the HSIA bra when I'm working out for my own comfort, but it's not really necessary and I would most likely be fine during my workout without the extra layer.
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Reviewed in the United States on May 7, 2026
★★★★★ 3
Cute but could be better
Color: Dark Pink, Size: 38DD
This bra definitely looks really good and has a sexy style to it. It does a decent job overall, especially for the price, but after trying two different bras from the same brand, I honestly liked the more expensive one much better.
The lace on this one is pretty, but it shows through thin shirts and tighter materials. The underwire also started digging into my skin after wearing it for a bit, and the lace caused some irritation. The fit wasn’t bad, but the pricier version was noticeably more comfortable and fit better overall.
For $16, this bra is still decent and looks nice, but if you’re deciding between the two, I’d recommend spending a little extra money on the more expensive one for the added comfort and better fit.
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Reviewed in the United States on May 21, 2026
★★★★★ 5
Best bra ever 💯
Color: Dark Pink, Size: 38DDD
I have seen these bras hyped everywhere especially tiktok, so I was expecting to be somewhat disappointed. Instead i am shocked by how much I love it and am immediately looking to buy more of them!! This is the most comfortable bra I have ever worn. I am a 38DDD, and it actually does appear to minimize and lift my chest in shirts while being so much more comfortable than any other bra. My back pain is gone???? Its affordable??? 100000000/10. Buy it 😭😭
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Reviewed in the United States on May 19, 2026
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