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Description
Pacemaker | 1⅝" Tri-Y Performance Headers | HSV AWD Coupe 4, Avalanche & XUV 5.7L | PH5366 L/R HSV KitPacemaker Tri Y Performance Headers HSV VY VZ AWD Coupe 4, Avalanche & Avalanche XUV 5. 7L Gen III PH5366 L R HSV Kit Unlock the performance potential of your All Wheel Drive HSV with the Pacemaker PH 5366 Tri Y Performance Headers. Specifically engineered for the unique chassis requirements of the AWD Coupe 4, Avalanche Wagon, and Avalanche XUV Ute, these headers provide a significant upgrade over factory manifolds. The Tri Y design is precision
Pacemaker Tri-Y Performance Headers - HSV VY-VZ AWD Coupe 4, Avalanche & Avalanche XUV 5.7L Gen III - PH5366 L/R HSV Kit
Unlock the performance potential of your All-Wheel Drive HSV with the Pacemaker PH 5366 Tri-Y Performance Headers. Specifically engineered for the unique chassis requirements of the AWD Coupe 4, Avalanche Wagon, and Avalanche XUV Ute, these headers provide a significant upgrade over factory manifolds. The Tri-Y design is precision-tuned to maximize exhaust scavenging, enhancing the torque and power delivery of the 5.7 Litre Gen III engine. Constructed with 1⅝" (41mm) primary pipes and 1⅞" (48mm) secondaries, this kit ensures optimal exhaust flow while maintaining essential clearances for power steering and air conditioning systems. Designed for automatic transmission models, these headers offer the high-quality, bolt-on performance Pacemaker is known for.
Features:
This product offers the following performance features:
- AWD Optimized: Custom-designed specifically for the HSV All-Wheel Drive (AWD) chassis.
- Tri-Y Design: Pulse-matched design to increase low-to-mid range torque, ideal for heavy-duty performance and daily driving.
- Premium Construction: Mandrel-bent 1⅝" (41mm) primary and 1⅞" (48mm) secondary pipes for superior exhaust velocity.
- High-Flow Outlet: Features a 2½" (63mm) outlet to support increased power levels.
- System Compatibility: Fully compatible with Power Steering and Air Conditioning systems.
- Precision Engineering: Designed to fit HSV VY and VZ models with the 5.7L Gen III engine and automatic transmission.
Product Specifications for PH 5366
| Feature | Value | Feature | Value |
|---|---|---|---|
| Part # | PH 5366 | Gasket | DSF 138 |
| Primary Pipe | 1⅝" (41mm) | Secondary Pipe | 1⅞" (48mm) |
| Outlet | 2½" (63mm) | Oxy Sensor | Yes |
| P/Steering | Yes | Fitting Time | 3 Hrs |
Important Notes:
- Wiring Extensions: Models VY Series II and VZ require Oxygen Sensor Wiring Loom Extensions (VY Series II: PEX5367Y x 1; VZ 5.7L: PEX5367Z x 1).
- Transmission: Specifically designed for Automatic transmission models.
Important Information
- The image shown may not reflect the actual product
- Shipping times may vary depending on destination and stock availability
Vehicle Applications:
| Make | Model | From | To | Body | Series | Engine | Variant | Drivetrain |
|---|---|---|---|---|---|---|---|---|
| HSV | Coupe 4 / Avalanche / Avalanche XUV | 2003 | 2006 | Coupe / Wagon / Ute | VY - VZ | 5.7L Gen III V8 | Automatic | AWD |
Warranty Information
| Product | Warranty Period |
|---|---|
| Pacemaker Headers | Two (2) years. |
| Pacemaker King Brown 4x4 Exhaust systems | Five (5) years. |
| Pacemaker Sports exhaust systems | Five (5) years. |
| Fabrication products and accessories | One (1) year. |
Payment & Security:
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
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Pacemaker Tri-Y Performance Headers - HSV VY-VZ AWD Coupe 4 / Avalanche / XUV 5.7L V8 - PH 5366 L/R HSV Kit
Unlock the performance potential of your All-Wheel Drive HSV with the Pacemaker PH 5366 Tri-Y Performance Headers. Engineered specifically for the rare AWD HSV line-up, including the VY-VZ Coupe 4, Avalanche wagon, and Avalanche XUV ute, these headers are designed to clear the complex AWD drivetrain while providing substantial gains in power and torque. The Tri-Y design focuses on optimizing exhaust scavenging for the 5.7 Litre Gen III LS1 engine, ensuring improved throttle response and a deep, aggressive V8 note. Built with mandrel-bent 1⅝" (41mm) primary pipes and 1⅞" (48mm) secondaries, these headers provide the high-flow efficiency needed for both street performance and heavy-duty use. Proudly Australian-made, this kit is specifically tailored for automatic transmission models.
Features:
This product offers the following performance features:
- AWD Specific Engineering: Custom-designed to fit the unique chassis and drivetrain of HSV All-Wheel Drive models.
- Tri-Y Scavenging: Optimized pipe routing to maximize mid-range torque and horsepower.
- High-Flow Construction: 1⅝" (41mm) primaries and 1⅞" (48mm) secondaries ensure smooth, unrestricted exhaust velocity.
- LS1 V8 Performance: Specifically tuned for the 5.7 Litre Gen III engine for optimal efficiency.
- Full Accessory Clearance: Maintains complete clearance for Power Steering and Air Conditioning systems.
- Precision Fitting: Designed for a high-quality fit on HSV VY and VZ AWD series.
Product Specifications for PH 5366
| Feature | Value | Feature | Value |
|---|---|---|---|
| Part # | PH 5366 | Gasket | DSF 138 |
| Primary Pipe | 1⅝" (41mm) | Secondary Pipe | 1⅞" (48mm) |
| Outlet | 2½" (63mm) | Oxy Sensor | Yes |
| P/Steering | Yes | Fitting Time | 3 Hrs |
Important Notes:
- Wiring Extensions: Models VY Series II and VZ require Oxygen Sensor Wiring Loom Extensions.
- VY Series II: Requires Part No PEX5367Y x 1.
- VZ 5.7Ltr: Requires Part No PEX5367Z x 1.
- Transmission: Specifically designed for Automatic models.
Important Information
- The image shown may not reflect the actual product
- Shipping times may vary depending on destination and stock availability
Vehicle Applications:
| Make | Model | From | To | Body | Series | Engine | Variant | Drivetrain |
|---|---|---|---|---|---|---|---|---|
| HSV | Coupe 4 / Avalanche / Avalanche XUV | 2003 | 2006 | Coupe / Wagon / Ute | VY - VZ | 5.7L Gen III LS1 | Automatic | AWD |
Warranty Information
| Product | Warranty Period |
|---|---|
| Pacemaker Headers | Two (2) years. |
| Pacemaker King Brown 4x4 Exhaust systems | Five (5) years. |
| Pacemaker Sports exhaust systems | Five (5) years. |
| Fabrication products and accessories | One (1) year. |
Payment & Security:
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
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
4.6 ★★★★★
Based on 14 reviews
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Product Reviews
★★★★★ 5
Good quality, fairly easy assembly
Color: White
Comfortable chair as advertised. Assembly time about 20 minutes with one screwdriver needed.
(Note: don't follow the instructions included. Lay the left arm assembly down on the floor and THEN affix the seat, followed by turning that over on its side and adding the right arm assembly. Trying to affix the two arms in an upright position is too difficult as directed.)
The only thing I don't like about it is the fluted upholstery on the seat and back, where a bit more padding would have helped greatly. Otherwise, it's comfortable and functional and reasonably priced. Delivery was on time.
ADDITIONAL COMMENTS AFTER 18 MONTHS OF USE: I've used the chair for 6-8 hours a day. The leather on the arms is cracking in multiple places. This is a big disappointment. And speaking of the arms, there's a major problem with the sewing of the leather on the outside edge of both left and right arms: the stitching is on the top at the outer edge, which means that it forms a jagged edge that your arms scrape on when resting on the leather. That jagged edge scraping my skin has caused a great deal of chafing, is most irritating, and could have been avoided entirely if they had just applied the stitching one inch further down on the side rather than along the top flat edge. This is a major design flaw. I will not buy this chair again because of the one flaw and the too-thin, cracking leather on the flat top of the arms, which is too bad, because it's fine in all other ways.
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Reviewed in the United States on April 13, 2020
★★★★★ 3
Good, but not great
Color: White
I work from home, so having a really comfortable chair that supports my back and provides me a nice place to sit for 8 hours is really important to me. I ordered this chair in March 2023 and was really happy with it at first. Sleek, easy to put together, and comfortable. I then had an issue with it because after I sat on it while wearing leggings, the entire seat and armrests turned black from the fabric. No other furniture I own turns black from my leggings. I reached out to the seller and they were kind enough to provide me a replacement for the seat and the two armrests at no charge. I went through the whole summer and didn't wear leggings. However, I am now in Oct 2023 and wearing leggings again. The chair seat and armrests are black again, but there is also a lot of wear to the chair in general. I understand I sit in it a lot, but the seat lost its comfort factor. Additionally, I lean on the left armrest a lot and it shows - there is a large indent on it. The fake leather material is just not for me and the chair no longer looks attractive. I wish it lasted longer considering how much I paid for it.
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Reviewed in the United States on October 9, 2023
★★★★★ 5
Worth Every Penny
Color: Black
Bought this chair Aug 2023 and as i come up on 3 years with this chair i can say i absolutely love this chair.
i bought this chair when i was having very bad back pain and assuming my old chair was to small i decided to purchase it. Zero complaints about this chair at all, no rips, cuts or broken parts. The chair does have some cracking but that's because I'm fat so its a lot for the chair to hold on a daily bases. I give this chair a lot of props for removing my back pain considering my back pain was due to a popped gallbladder that was infected..
If you are reading reviews and looking for a good chair that's worth the money just get this. Its easy to assemble & it has great stability AND most importantly it holds the weight of myself.. I'm built like a butter ball turkey..
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Reviewed in the United States on June 9, 2026
★★★★★ 1
1 year review from a teleworker
Color: Grey
I purchased the Homall Office Chair in March of 2022, with high expectations of comfort and functionality. I liked how the chair looked, its price point, and it received positive reviews. Unfortunately, my experience with this chair has been underwhelming, to say the least. Several issues, ranging from poor quality to difficult assembly, have left me deeply dissatisfied with my purchase.
Let's start with the assembly process, which was an absolute nightmare. The instructions provided were not terrible, but not great either. It took me significantly longer than anticipated to assemble this chair, and I consider myself fairly handy. If you're not well-versed in putting together furniture, you may find yourself extremely frustrated.
Another significant issue I encountered was with the chair's hydraulic cylinder. It has already started failing, causing the chair to slowly sink, regardless of the adjustment settings. This rendered the height adjustment feature useless and made for an uncomfortable seating position. I expected a durable and reliable chair, but sadly, this was not the case.
The armrests were also a major disappointment. They started to deform and indent where my elbows and arms sit. The rest of the chair is fine. I can sit it in all day, so that is a positive. I mainly lean a bit forward and don't have time to lounge backward.
On top of all these issues, the Homall Office Chair proved to be quite noisy. Whenever I shifted my weight or made any slight movements, the chair emitted creaking and squeaking sounds. Not only was it an annoyance, but it also disrupted my concentration while working and is embarrassing on conference calls. Having such a distracting and low-quality chair in a professional environment is disappointing.
If I read this review I would have a couple of questions about the reviewer. I am 6'3" but well below the recommended weight. I review plans and specs as part of my job, so I am good with instructions. My hobby is woodworking which requires skill and a calm demeanor. Yes, I did retighten any connectors that became loose through normal wear and tear.
I should have spent more money on a quality chair since I am now looking to purchase a different chair 1 year later. I would advise others to take that into consideration. Spend a little more and keep less junk out of our landfills.
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Reviewed in the United States on May 26, 2023
★★★★★ 5
High Quality Rolling Chair
Color: Black/Silver
My son LOVES this desk chair. He has a drafting table to draw and do schoolwork on, and this provides him a comfortable chair to work in. It is sturdy and easy to clean. It does not fold, but it does roll easily. It was VERY EASY to put together. We were also pleased with the price. He will be able to use it for years to come.
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Reviewed in the United States on January 2, 2026