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Go Fast

Mach 2 100% Recirculating Diverter Valve

$192.00 $180.45 Save $11.55

SKU: T9125

Special Order
Special Order
Ships in 4–6 weeks
Free Shipping over $200
$100 Minimum Order
30 Days Return

Description

The Go Fast T9125 Mach 2 TMS Recirculating Diverter Valve is an essential modification for turbocharger owners seeking improved boost response and performance. The Mach 2 addresses common issues with stock diverter valves, which can sometimes be designed to release pressure above a certain point to protect the engine or are not optimized for throttle response. The T9125 features a pressure-balanced design that can effectively hold unlimited boost, ensuring optimal performance under demanding conditions. Its recirculating nature means all bypassed air is sent back into the intake tract, maintaining a stealthy operation. Installation is straightforward as it is designed as a "bolt-on" solution, requiring no additional adaptors, parts, or vehicle modifications for many applications. Simply remove the factory bypass valve and install the Mach 2 in its place. The specific inlet and outlet sizes are 25mm. While many applications are universal, specific "bolt-on" kits are available for popular turbo models. The product page also lists extensive fitment details for various VW, Audi, Ford Australia, and Saab models, often noting the requirement for the atmosphere venting option kit (part number 5925) and whether two valves are required for certain configurations (e.g., Audi S4 B5 2.7 Biturbo).

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandGo Fast
Part NumberT9125
CategoryAir and Fuel
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1M+ Enthusiasts
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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

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