The world's first ADJUSTABLE NOISE BOV * for street or track conditions at a twist of the wrist!

By utilising a unique air diverting system you control exactly how much air you dump to the atmosphere for noise, or the inlet for silence. By sending the vented air back to the inlet (rather than muffling it), there is no restriction and the valve still operates at maximum efficiency.

For cars with sensitive air flow meters, the valve can be tuned to vent just enough air back to the inlet to prevent backfiring whilst giving the loudest possible blow-off noise. No more guessing which valve will work on your car - this one will do it all!

Colours available: red, blue, silver or black.

The WRX Stealth FX is a direct bolt-on replacement blow-off valve for all late model Subaru WRX’s and STi’s from MY01 with no adaptors, extras or modifications required.

Quick and easy installation with supplied items in the kit.

Only the Stealth FX allows you to go from silent and unnoticeable to ear shattering in a matter of seconds!

Replacing BOV on WRX noticeably improves throttle response, and is definitely recommended in applications where the boost has been raised, since WRX factory blow-off valve is actually designed to leak at boost pressures exceeding the factory level

Colours available: red, blue, silver or black.

Finally, a bolt-on blow off valve for the S14 and S15 200SX!

The unique flange allows the Stealth FX to be attached directly to the factory valve mounting bracket. No hose cutting, no extra adaptors, and no hassles!

Colours available: red, blue, silver or black.

Now available to suit the R33 Nissan Skyline GTS-T

The versatility of the Stealth FX, combined with the quality fit of a factory component makes this valve the only logical choice.

Colours available: red, blue, silver or black.

One of the loudest valves in the range, the Mach 1 will ensure you’re heard before you’re seen!

Featuring a single trumpet discharge outlet, this is a good replacement for factory valves and can help to reduce turbo lag and increase throttle response while blasting out a great WHOOOSH! noise between gears.

Colours available: red, blue or silver.

Designed as a replacement for re-circulating-type factory valves, and also for those who prefer to remain inconspicuous!

Features superior boost holding and throttle response compared to a standard factory unit, and looks great under the bonnet too.

Colours available: silver.

Featuring two venting outlets, one is a re-circulation outlet and the other dumps to atmosphere. This system means that about 50% of the air is re-circulated, resulting in an audible but slightly more subdued blow-off noise. It also means that certain Audi/VW, Nissan, Mitsubishi and other cars with sensitive airflow meters can use this valve and make a great blow-off sound without backfiring or ECU error codes. No other manufacturer can boast such success with these types of cars.

Colours available: red, blue or silver.

Basic in design, but big on performance!

The Basic is actually the highest flowing valve in the universal range. The 5-hole pattern ensures a huge venting area and free-flowing air path.

Colours available: red, blue or silver.

For those with lots of power and who want lots of noise!

Twin staged trumpets make this a very responsive valve with a flow capacity large enough to handle BIG POWER applications.

Colours available: red, blue or silver.

The WRX Hybrid valve is designed specifically to bolt straight onto all late model Subaru WRX’s and STi’s from MY01 with no adaptors, extras or modifications required.

The Hybrid design allows the valve to be configured to return a portion of the vented air to the inlet, meaning no more air flow meter problems and a great sound. The kit also includes a blanking cap for the return outlet allowing the valve to vent 100% to atmosphere for maximum noise!

Replacing BOV on WRX noticeably improves throttle response, and is definitely recommended in applications where the boost has been raised, since WRX factory blow-off valve is actually designed to leak at boost pressures exceeding the factory level

Colours available: red, blue or silver.

The Mach 2 is designed specifically to bolt straight onto all late model Subaru WRX’s and STi’s from with no adaptors, extras or modifications required.

This valve is for those who want maximum noise! A large single trumpet and the omission of the plumb back option means that the MACH 2 is loud, efficient, and more affordable than the WRX Hybrid model.

Replacing BOV on WRX noticeably improves throttle response, and is definitely recommended in applications where the boost has been raised, since WRX factory blow-off valve is actually designed to leak at boost pressures exceeding the factory level

Colours available: red, blue or silver.