• Blow off/ Bypass valve kit for 1st gen GT Probe,

Blow off/ Bypass valve kit for 1st gen GT Probe & 1st Gt Mazda Mx6

Fully adjustable and tuned for 1st gen Ford Probe GT's

Can be used in blow off setup or bypass recirculation setup.

Kit includes;


Vacuum hose

Caps for changing modes.

Hose to attach valve to your intake piping with clamps, you can use some of your original clamps from factory also.

Installation instructions.

The top of the blow off valve rotates to adjust the pressure of when the blow off releases intake pressure.

These are currently in pre-order stage and will ship out starting May 27th, 2021 to all orders.


This a truly remarkable valve that gives a combination of blow off and recirculation valve operation, all at the same time, and has been specifically designed for the many turbo engine applications that operate metered airflow management systems. This means you get all the noise of the blow off valve whilst retaining the compatibility with the recirculation requirements of the engine management system. As a bonus we also offer the ability to convert the valve to recirculation only mode for those times when stealth running is required.

This valve uses a Brass piston which utilizes new sealing technology along with a variable spring preload, incorporating a ratchet type top adjuster that will allow for the positive and precise adjustment to match the valve to your engine. This is achieved by using a unique single, conical, progressive rate spring, that can allow for the retention of boost pressure over a wide adjustment range. This unique spring design also allows for unrestricted piston travel and flow volume regardless of the amount of pre-load adjustment added to the spring.

Other manufacturers' valves use cylindrical springs with adjustable pre-load, which often experience restricted piston travel and a reduction in flow volume. When we say our products are Engineered For Performance, it's not a catchy sales phrase, it's the truth. and we prove it with every product we manufacture.

Adjustment of the valve is done by turning the ratcheting adjustment knob located on the top of the valve. Turning the knob clockwise will stiffen the spring for higher levels of boost retention, while turning the knob counter-clockwise will loosen the spring tension for lower levels of boost retention.

The spring used in the valve is a conical (i.e.: collapsible) progressive rate spring designed to retain a wide range of boost levels depending upon the adjustment of the valve.

The adjustment knob is ratcheted and there are 8 "clicks" per 1 full revolution of the knob (360 degrees). There are also roughly 6 and one half full revolutions of the knob available enabling about 53 "clicks" to provide a wide range of adjustment. This ratcheting feature also allows the user to keep track of their adjustments for varying boost levels. i.e.: a different boost level for pump gas vs. race gas.

Once the valve has been fitted to the vehicle, adjustment of the spring pre-load may be undertaken to appropriately tune the valve to the boost output level of the given application onto which it is being installed. Each user will need to adjust their valve so that it will hold boost all the way to the specified redline of their application under wide open throttle without experiencing any valve fluttering at full-boost throttle lift.

If valve fluttering is felt at full-boost throttle lift, this is typically an indication that the valve is adjusted too stiffly.

If the valve is leaking under wide open throttle before the specified redline of the application is reached, this typically means that the valve is adjusted too softly.

Please note that valve fluttering under partial throttle conditions or partial boost throttle lift is a normal occurrence as IS NOT an indication of compressor surging. Partial throttle or partial boost valve flutter is solely an indication that the valve is responding directly in a completely normal way to an inconsistent pressure differential on either side of the throttle body as it is being modulated. Compressor surging would only be experienced if full-boost throttle lift valve flutter is experienced under prolonged circumstances and is not corrected immediately.

Please take note: the adjustment knob on the valve is NOT a means by which to adjust the atmospheric noise level of the valve. It is solely a means by which to adjust spring pre-load. We have specifically designed this product with specific tolerances that restrict re -circulating and atmospheric function to a level that will ensure no adverse effects on the engine management system (ECU), fuel trims, mass airflow meter, etc. This ensures no possibility for check engine lights or fault codes of any kind unless in such an instance where the user may be using the valve fully atmospherically.

As mentioned previously, this valve is capable of being setup in 3 possible ways:

- Hybrid - Atmospheric AND Re -circulating Operation

- 100% Re -circulating

- 100% Atmospheric (Done at the users own risk of possible incompatibility with their application)

Each setup requires that the valve ports be setup in a specific way. The discharge ports and included plug are removable and interchangeable. Need to know more on the other setup, send us an email sales@fordprobeparts.com

Direct from us, the valve is setup for Hybrid re-circulating and atmospheric operation and the blanking plug is not used. Nothing will need to be changed prior to installation for the use of this setup. 

This setup recommended for the 1st gen GT Probe.

Blow off valve kit installation demo video.

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Blow off/ Bypass valve kit for 1st gen GT Probe,

  • Product Code:Blow off/ Bypass valve kit for 1st gen GT Probe,
  • Availability:7
  • $74.99

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