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Description
GFB Polaris RZR Turbo SXV Recirculating Bypass ValveThe factory diverter valve on Polaris SxS models is made from plastic with a rubber diaphragm. It is known to rupture and cause significant boost leaks, and its "normally open" design means that part throttle boost response is always compromised. The GFB DV+ is a direct replacement diverter valve that offers the ultimate in reliability and performance, backed by a lifetime warranty. Installation Instructions This Part Fits: Year Make Model Submodel
The factory diverter valve on Polaris SxS models is made from plastic with a rubber diaphragm. It is known to rupture and cause significant boost leaks, and its "normally open" design means that part throttle boost response is always compromised. The GFB DV+ is a direct replacement diverter valve that offers the ultimate in reliability and performance, backed by a lifetime warranty.Installation Instructions
This Part Fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 1997-2005 | Audi | A4 | Base |
| 2003-2006 | Audi | A4 | Cabriolet |
| 1999-2005 | Audi | A4 Quattro | Avant |
| 1997-2005 | Audi | A4 Quattro | Base |
| 2000-2006 | Audi | TT | Base |
| 2002 | Audi | TT Quattro | ALMS Edition |
| 2000-2006 | Audi | TT Quattro | Base |
| 2020-2021 | Polaris | RZR PRO XP | Base |
| 2020-2021 | Polaris | RZR XP 4 Turbo | Base |
| 2020-2021 | Polaris | RZR XP Turbo | Base |
| 2016-2019 | Polaris | RZR XP Turbo EPS | Base |
| 2018-2019 | Polaris | RZR XP Turbo EPS DYNAMIX Edition | Base |
| 2018 | Polaris | RZR XP Turbo EPS Fox Edition | Base |
| 2019 | Polaris | RZR XP Turbo EPS LE | Base |
| 2018-2020 | Polaris | RZR XP Turbo S | Base |
| 2020 | Polaris | RZR XP Turbo S Velocity | Base |
| 2017-2018 | Porsche | Macan | GTS |
| 2015-2018 | Porsche | Macan | S |
| 2015-2018 | Porsche | Macan | Turbo |
| 1999-2001 | Saab | 9-3 | Base |
| 1999-2003 | Saab | 9-3 | SE |
| 1999-2002 | Saab | 9-3 | Viggen |
| 2000-2001,2008-2009 | Saab | 9-5 | 2.3t |
| 2000-2004,2008-2009 | Saab | 9-5 | Aero |
| 2004-2005 | Saab | 9-5 | Arc |
| 1999 | Saab | 9-5 | Base |
| 2000 | Saab | 9-5 | Gary Fisher |
| 2009 | Saab | 9-5 | Griffin |
| 2002-2004 | Saab | 9-5 | Linear |
| 1999 | Saab | 9-5 | SE |
| 1999-2003 | Volkswagen | Beetle | GL |
| 1999-2005 | Volkswagen | Beetle | GLS |
| 1999-2004 | Volkswagen | Beetle | GLX |
| 2001-2002 | Volkswagen | Beetle | Sport |
| 2002-2004 | Volkswagen | Beetle | Turbo S |
| 2000-2001 | Volkswagen | Golf | GLS |
| 2002-2006 | Volkswagen | Golf | GTI 1.8T |
| 2003 | Volkswagen | Golf | GTI 20th Anniversary |
| 2002 | Volkswagen | Golf | GTI 337 |
| 2000-2001 | Volkswagen | Golf | GTI GLS |
| 2003-2005 | Volkswagen | Jetta | GL |
| 2004-2005 | Volkswagen | Jetta | GLI |
| 2000-2005 | Volkswagen | Jetta | GLS |
| 2001,2003 | Volkswagen | Jetta | Wolfsburg Edition |
| 2003-2005 | Volkswagen | Passat | GL |
| 1998-2005 | Volkswagen | Passat | GLS |
| 2004-2005 | Volkswagen | Passat | GLS 4 Motion |
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Exchange/Return Notes
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4.2 ★★★★★
Based on 24 reviews
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Product Reviews
★★★★★ 5
Would Buy Again!
Color: Black, Style: With Headrest, Color: Black, Style: With Headrest
Purchased this chair several months ago and very pleased with the quality, durability, lumbar support, head rest, rollers and multiple adjustment. I use it some 8 hours a day, it's very comfortable, and highly recommend. Thus far great product for the value.
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Reviewed in the United States on June 2, 2026
★★★★★ 3
Needs improvements
Color: Light Black, Style: With Headrest
I bought 4 chairs for my table.
Easy to put together.
The arms are too short. They move too much and there is no way to lock the arms in place.
The worse thing is the material used to cover the arms. It is sticky. Each chair has the same problem so I took a pair of socks to cover the arms. So, you should offer custom arm covers and a way to lock the arms.
For the weight allowed the pneumatic support that holds and adjusts the height of the seat holds me quite well.
The wheels stick out beyond the seat circumference so everyday I run into them as I go to sit down but it is a good thing as you can be seated and you are not going to flip over if you bend down from the seat to reach for something on the floor.
The seat itself should be able to accommodate a person of a larger size a big man. It is like you made the chair for little people that weigh a lot (narrow seat, short arms, vs. a large wheel span and powerful the pneumatic pump).
The neck support requires a pillow. Without the pillow my head and neck do not rest on the mesh.
Regarding comfort, I sit in the chair for a lot of time each day. Although it feels a bit hard the seat is fairly comfortable. It would be more comfortable if it were bigger.
I purchased these chairs because of the welcoming way the company describes itself, therefore, I hope they will make some changes to improve the chair. I would not buy them if I had the chance again, not without improvements made. I don't need four more chairs, so, I will live with my purchase. If the chairs already had those improvements my opinion would be different. They may be perfect for someone else of a different body type (and age).
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Reviewed in the United States on October 27, 2025
★★★★★ 5
Finally a Chair That Fits and Feels Great
Color: Black, Style: With Headrest
I recently purchased the Marsail Ergonomic Office Chair, and overall, I couldn’t be happier with it.
First off, assembly was incredibly simple. It took me about 30 minutes from start to finish, and the instructions were clear and easy to follow. All the parts were well packaged, and I didn’t run into any issues putting it together.
For reference, I’m 6'2" and about 275 pounds, and this chair fits me very well. As a bigger guy, finding a chair that feels supportive and appropriately sized can be a challenge, but this one hits the mark. The seat is roomy without feeling oversized, and the overall build feels sturdy and solid.
Comfort-wise, it’s been excellent. I work from home and spend about 8–9 hours a day in this chair, five days a week. The thick cushion seat really makes a difference, it stays comfortable throughout the day and doesn’t feel like it’s flattening out after hours of use. I also really like the mesh back. It provides good support while allowing airflow, which helps keep me cool during long work sessions.
The only feature I wish it had is a recline lock at multiple angles. Currently, it only locks in the fully upright position. It would be great to be able to lock it slightly reclined for more flexibility during long workdays.
That said, for the price, ease of assembly, and all-day comfort, this chair delivers tremendous value. I’m giving the Marsail Ergonomic Office Chair 5 stars and would definitely recommend it to anyone looking for a comfortable, supportive office chair, especially if you’re on the taller or bigger side like me.
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Reviewed in the United States on March 2, 2026
★★★★★ 5
This is a terrific office chair at a great price!
Color: Dark Blue, Style: pack of 1
Easy to assemble, with comfortable armrests, lumbar support, and all the functions...it can rock, recline, roll and swivel, plus the seat control easily adjusts up & down, and it comes in a variety of colors. This is my best Amazon purchase ever!!
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Reviewed in the United States on May 22, 2026
★★★★★ 5
A Solid, No-Frills Office Chair That Gets the Job Done
Color: Black, Style: pack of 3
I bought the BestOffice Home Office Chair Ergonomic Desk Chair because I needed something affordable and functional for our conference room. I wasn’t looking for anything high-end—just something comfortable enough to get through staff meetings without complaints of sore backs.
Out of the box, assembly was pretty straightforward. It took me about 20–30 minutes, and the instructions were clear enough that I didn’t run into any major issues. Once set up, the chair feels lightweight but stable, and it rolls smoothly across the low pile carpeted office floor.
The mesh back is probably the best feature. It keeps airflow going, which makes a big difference if you sit for long periods or in a warmer environment. I’ve had padded chairs before that trap heat, so this was a noticeable improvement right away.
The lumbar support is decent for the price. It’s not adjustable in a high-end sense, but it does help encourage better posture and reduces that “slouching into the chair” feeling over time. The armrests are basic, but they do the job for light support.
Comfort-wise, it’s good for moderate use. I can sit in it for a few hours at a time without discomfort, but if you’re planning to sit all day every day, you might want something with more padding and customization.
A few drawbacks worth mentioning:
The cushioning is on the firmer side and I worry may wear with extensive use
The chair is more budget-oriented in build quality
Adjustability is somewhat limited compared to higher-end ergonomic chairs
That said, for the price, it delivers exactly what it promises. It’s a simple, functional office chair that covers the basics without overcomplicating things.
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Reviewed in the United States on March 23, 2026