SKU: 37645800304

Dual Piston Blow Off/Dump Valve

Sale price$97.19 Regular price$107.99
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Ships within 48 hours · Estimated delivery Jul 22 - Jul 27

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Description

Dual Piston Blow Off/Dump ValveSuitable for most turbo cars with an Air Flow Meter. Made from billet aluminium, this atmospheric diverter valve dumps the charge air to atmosphere creating the "Whoosh" sound when the throttle is lifted. This increases both quicker throttle response and higher clamping load to maintain boost pressure more reliably. Unlike single piston or diaphragm diverter valves, this uses counter balanced springs and dual pistons to prevent the valve from leaking

Suitable for most turbo cars with an Air Flow Meter. 

Made from billet aluminium, this atmospheric diverter valve dumps the charge-air to atmosphere creating the "Whoosh" sound when the throttle is lifted. This increases both quicker throttle response and higher clamping load to maintain boost pressure more reliably. Unlike single piston or diaphragm diverter valves, this uses counter balanced springs and dual pistons to prevent the valve from leaking air into the intake system at idle. This prevents our diverter valves suffering any of the failures associated with single piston and diaphragm type diverter valves.

All Forge Motorsport Dual-Piston Atmospheric Valves have been designed and built with the intent of venting 100% of the residual charge air remaining in your forced induction system to the atmosphere at throttle lift. While we have incorporated many elements into the design of the Dual-Piston valves to aid in their compatibility with mass air-flow sensor equipped vehicles, we cannot always guarantee that each individual’s application will be compatible with a valve that vents the charge air into the atmosphere.

Forge Motorsport nor any of it’s Authorised Distributors can assume any responsibility for any adverse effects resulting from the installation of this valve onto a vehicle whose engine-management-system, whether factory or aftermarket, is not capable of compensating for the loss of metered air through a vent-to-atmosphere valve such as this.

 

In The Box:
1 x FMDV004 Valve
1 x Forge Sticker

If you wish to tune this product to fit the needs of your engine, please see the spring tuning kits below.

The valve has a port size of 25mm

We recommend servicing your valve every 3 years, or 20,000 miles, whichever comes sooner

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: 37645800304

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Blusher
Los Angeles, US
★★★★★ 3
Right fit
I love this shirt it was nice and bright when I got it after a few wash it started to fade out a bit was a perfect fit for a medium built person 5’7 I still would recommend this product they are really nice and thick
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Reviewed in the United States on September 14, 2025
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Linda Mokkosian
Cuba, US
★★★★★ 5
Excellent value and has saved me from the sun!
Fit Type: Regular Fit, Color: White, Size: Large
I ordered this large mans shirt because it was 100% cotton and long sleeve. I am a woman and use it to protect myself from the sun walking my dog, very stiff at first, but comes out with several washes. I love the shirt!
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Reviewed in the United States on June 9, 2026
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Wilf
Whiting, US
★★★★★ 4
NICE Shirt that SHRINKS!!
Fit Type: Regular Fit, Color: Blue, Size: X-Large
Loved this shirt right out of the package. Put a little steam pressing on it and it was perfect. Has a thicker softer feel than most casual dress shirts. Ordered XL with the "regular" fit and it could be worn tucked or out without it looking overly blousy. SADLY, after a first wash on cold and tumble dry low, and pulled it out early and it shrunk by almost a full size!!! The sleeves, length of shirt and overall fittage shrunk so that now it fits like a snug large. I've never had a shirt shrink like this, hence, the one star off. I would have given it 2 stars off, but the original quality of the shirt is nice, just beware of the shrinkage factor. Don't put it in the dryer at all, only air dry it. I'm tempted to reorder another but just then never put it in the dryer.
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Reviewed in the United States on May 23, 2026
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Josh Rod
Bozeman, US
★★★★★ 5
Shirt worth buying several times
Size: XX-Large, Color: Anthracite Polo Stripe
Purchased another of same order and have found them to be excellent. Comfort, sizing, and quality. Can be dressed up or dressed down and they look great either way. Worn in very hot weather and have not been oppressed by sweat. Nice. Will be purchasing more. Sizing was great. Loose and long enough to land just right over pants pocket top.
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Reviewed in the United States on June 1, 2026
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TheKaizenOne
Alexandria, US
★★★★★ 5
Great Quality and Comfortable Fit
Size: Large, Color: Washed Blue
I picked up the Amazon Essentials Men’s Golf Polo Shirt, and I’m really impressed. The fabric is soft, breathable, and lightweight — perfect for hot days on the golf course or casual wear. The fit is spot-on, not too tight or too loose, and it looks sharp tucked in or out. It’s held up well after multiple washes without shrinking or losing shape. For the price, it’s excellent quality and a great value. If you need a reliable, comfortable polo for sports or everyday wear, this one is a solid choice. Highly recommend!
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Reviewed in the United States on September 5, 2025

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