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Description
XForce | Dual 3" Varex Universal Valved Muffler | 304 Stainless Steel Oval | VMK31-300XForce Dual 3" Varex Universal Valved Muffler VMK31 300 Make it loud, make it quiet, make it yours. The XForce VMK31 300 features our patented Varex valved technology, providing enthusiasts with the ultimate exhaust solution. This universal muffler allows you to switch between a civilised, stock like sound and a wide open performance note at the touch of a button. Proudly Mandrel Bent and crafted from premium 304 Stainless Steel, this dual in, dual
XForce Dual 3" Varex Universal Valved Muffler - VMK31-300
Make it loud, make it quiet, make it yours. The XForce VMK31-300 features our patented Varex valved technology, providing enthusiasts with the ultimate exhaust solution. This universal muffler allows you to switch between a civilised, stock-like sound and a wide-open performance note at the touch of a button. Proudly Mandrel-Bent and crafted from premium 304 Stainless Steel, this dual-in, dual-out muffler is the perfect centerpiece for high-horsepower custom exhaust builds.
What's in the Box?
- Dual 3" Varex Universal Muffler
- Pre-installed Internal Valve & Actuator Motor
- 2 x Wireless Remote Key Fobs
- Control Module & Wiring Harness
Note: This is a universal component for custom fabrication. An X-pipe or Merge-pipe MUST be installed upstream of this muffler for optimal performance. Ensure a 2-inch clearance for the actuator motor during fitment.
Features:
Engineered for maximum versatility and sound control, this muffler offers the following features:
- Patented Varex Valve: Manually toggle between Closed, 25%, 50%, 75%, and Fully Open positions to suit your environment.
- Dual 3" Configuration: High-flow twin 3-inch (76mm) inlets and outlets with 2-bolt flanges for secure connection.
- Smartbox Compatible: Upgradeable to Smartbox control for smartphone app integration, geo-fencing, and automated valve modes.
- Premium 304 Stainless: Full 304-grade stainless steel construction for superior durability and a high-lustre finish.
- Compact 6"x10"x15" oval body designed for easy integration into various chassis types.
Specifications:
- Part Number: VMK31-300
- Material: 304 Stainless Steel
- Inlet/Outlet: Dual 3-Inch (Flanged)
- Body Dimensions: 6" x 10" x 15" Oval
- Control: Electronic Remote (Wireless)
- Required Upstream: Merge-pipe or X-pipe
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 |
|---|---|---|---|---|---|---|---|---|
| Universal | Custom Fabrication | Any | Any | Any | N/A | Any | Custom Build | Any |
Warranty Information
| Product Type | Warranty Period |
|---|---|
| 304 & 201 Stainless Steel Exhaust Systems | 60 Months |
| Accessories | 12 Months |
| Catalytic Converters | 12 Months |
| Electronic Products (Including SmartBox) | 12 Months |
| Mild Steel & 409 Stainless Steel Exhaust Systems | 24 Months |
| Mild Steel Headers | 12 Months |
| Stainless Steel Headers | 24 Months |
| Universal 304 Stainless Steel Mufflers | 24 Months |
| Universal Mild Steel & 409 Stainless Steel Mufflers | 12 Months |
Payment & Security
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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
4.5 ★★★★★
Based on 907 reviews
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Product Reviews
★★★★★ 2
My raptor GSP destroyed this dino toy
Color: Medium - Dilophosaurus, Color: Medium - Dilophosaurus
My dog ripped this toy apart faster than the trex did the lawyer in Jurassic Park. 2 hours! Arm was ripped off, stuffing pulled out methodically over the next to days. Now it is a gutless husk. The metor was kinder to the og dinos than my gsp was to this. Sorry Bite Force. Open to product sampling tho!
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Reviewed in the United States on May 19, 2026
★★★★★ 4
My Hero pup is super happy with it
Color: Large - Billy the Beast Monster
I was super excited to order this and had waited some time to do so. I wanted Big Billy The Beast Monster in large Green, he’s an awesome looking guy. My Golden Retriever was all over me while I was up packaging Him and his tail was in helicopter mode. He was so excited to have it and carried it around the house everywhere we went, he’s laying on me with his head in my lap and Billy’s right next to him. Reason for buying it? Well he loves plushies but there are not many available out there that can stand up to this 80 pound chew monster so I have to keep him on harder stuff, 2 of which are the cheapest toy skull and crosses in orange and blue from a cheap outlet site but he loves them. Orange was first then when we pulled out the blue one he had a aha moment. Now with Billy he was on a whole new level of excitement, I’ve never seen him this excited over a toy, he can’t stop carrying it with him everywhere and showing it off to the other pups I have, there’s no growling or resource guarding but he definitely won’t want to share and that’s of because I always take away any plushies that he gets to because he is serious about chewing. This being made with Kevlar gave me hopes of longevity but he had the ears and the end of 1 hand chewed off in under 2 hours, am I disappointed…yea a little but he has gotten so much joy out of it that it’s made me really happy to have bought it anyway, see he’s my Service Dog so he spends a lot of time being so serious and working that he needs any outlet for spending energy possible and he’s so happy with it that it makes me happy. As I’m writing this he’s asleep with his head in my lap and Billy right next to him looking very tired and happy and that my friends is worth all the beans in the world.
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Reviewed in the United States on May 4, 2026
★★★★★ 5
Survives agressiveness
Color: Large - Billy the Beast Monster
This toy is absolutely for aggressive chewers,my yorkies usually have their stuffed animals torn apart within a day,been a week and not 1 rip! Very happy with it and worth the money!!!
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Reviewed in the United States on May 29, 2026
★★★★★ 4
Great except for one small flaw
Color: Regular - Beak, Color: Regular - Beak
Our dog likes to get at the juicy innards of every toy we buy him. We tried this one as it promised to be "bullet proof". It lasted about a week which in fairness is 6.5 days longer than most of the toys we buy last. He ripped off the wings which was to be expected and not an issue. It took him another 6 days to finally locate a weak point and break in. It appears that the tag is not made of kevlar but merely sewed on. I guess it would be better if they had just sewed it on top but they made it part of the overall structural integrity. This provided a small area of weakness which our dog located and proceeded to exploit. It's like having the death star but installing a small thermal exhaust port that allows for access to the very core of the station. Makes little sense. Overall I am pleased with the overall sturdiness but in the end this toy had a small design flaw that my dog was able to locate and exploit in his neverending quest to gain access to and eat polyester fiber stuffing
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Reviewed in the United States on March 6, 2026
★★★★★ 5
STRONG AS A MONSTER (albeit a cute one)
Color: Large - Billy the Beast Monster, Color: Large - Billy the Beast Monster
My aggressive chewer ate the adorable monster's ear off on the first day, but who cares? The body of the monster has been indestructible so far (one week). My 7 month old pup cbews it for a good 10-15 minutes at a time several times per day. Great quality product and outlasting all the other toys I bought (which she destroyed in 10 minutes - even the ones rated "Level 4 toughness" from Walmart. I think it's hilarious in my photo that the monster's expression perfectly shows his disappointment about missing an ear, LOL.
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Reviewed in the United States on June 3, 2026