Product Details: GFB pioneered the Hybrid system back in 1998 (which has since been copied by many other manufacturers), featuring two venting outlets, one is a recirculation outlet and the other dumps to atmosphere. This system means that about 50% of the air is recirculated, 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.

The latest version of the Hybrid allows the user to vary the noise characteristics of the valve, essentially making the Hybrid three valves in one! By swapping either the trumpet or the recirc outlet for a special plug (now supplied), you can change the valve to 100% recirc (silent), 50/50 recirc/atmosphere (medium noise), or 100% atmosphere (loudest).

Fits:

Ford Falcon XR6 Turbo (BA model)
    -Required Adaptor: 5025 and 5250
*when installing a GFB valve, it must be installed in the REVERSE direction compared to the factory one. This is essential for the valve to operate properly. Incorrect orientation of a GFB valve will not allow the piston to open*

Ford Laser TX3 Turbo 4WD KE - KHII (1987 – 1993)
    -Required adaptor: 5020 and 5220
    -Direct Bolt On

Ford Telstar TX5 Turbo AS - AV (1986 – 1991)
    *Can be fitted to your TX5 by welding a steel pipe adaptor to the factory steel pipe leading up to the throttle. A short section of weld-on pipe is supplied with BOVs 1001 - 5, and is available as optional part no. 5601 for others*

Holden VL Commodore Turbo (1986 - 1988)
    *Since there is no factory fitted bypass valve, installation of a blow-off valve is a custom job, requiring a short length of steel pipe to be welded onto the inlet piping between the turbo and the throttle.*

Mazda 626 and MX-6 Turbo (1986 - 1991)
    *The 626 and MX-6 turbos have a small factory bypass valve mounted very near the turbo itself, and its location is not suitable for fitting an aftermarket valve. Fitting a GFB blow-off valve to your 626 or MX-6 requires that a short section of steel pipe be welded onto the intake between the intercooler; if there's one fitted; and the throttle. The BOV will then secure on this pipe. Weld-on pipes are available in steel, to suit factory inlet plumbing, as well as aluminium and stainless steel to suit custom intercooler plumbing*

Mazda RX-7 S4 & 5 (1986 – 1991)
    *Custom Installation: usually involve fabricating a replacement turbo-intercooler up-pipe with a 25.4  mm pipe welded on to mount the GFB valve. When using a GFB BOV on an RX-7 with a front mounted intercooler, the BOV should be custom installed by welding a short section of pipe onto the intercooler plumbing*

 -When using the factory engine management computer, The GFB Plumback and Hybrid are recommended since they can be used successfully on air-flow metered vehicles.

Mitsubishi Starion Turbo JA - JD (1982 - 1987)
    *Because there was no factory BOV, fitting one will require welding a short length of steel pipe somewhere between the turbo and the throttle, on a non-intercooled Starion, or between the intercooler and the throttle on a JD Starion. This kind of work can be easily and economically carried out by a workshop that's familiar with modified cars.*

Mitsubishi Cordia GSR Turbo AA - AC (1984 – 89)
    *The Cordia wasn't fitted with a blow-off valve as standard so fitting a GFB BOV can improve after-gear-change throttle response when driving hard. It will also prevent compressor surge and of course provide the characteristic ‘PSSH' noise that turbo cars like the Cordia are all about! Fitting a GFB blow-off valve to your Cordia requires that a steel pipe be welded onto the intake plumbing between the turbo compressor outlet and the throttle, after the intercooler if one has been fitted. This kind of job can easily and economically be carried out by a performance oriented workshop.*

Mitsubishi CC Lancer GSR (1992 - 1996)
    -Required Adaptor: 5233
    -Direct Bolt on
*Lancer GSRs use a factory valve which is designed to leak at boost levels higher than factory, so it is worthwhile replacing if you plan to increase boost levels. GSRs have no problem with vent-to-atmosphere blow-off valves*

Mitsubishi Lancer EVO
    -Required Adaptor: 5233
    -Direct Bolt on
*Most early EVO models have no problems with atmosphere-venting, however the later EVO VI-VIII, in particular the US models, generally prefer to recirculate at least some of the vented air. For these models, it is best to use the Plumb Back, Hybrid, Stealth FX or Deceptor Pro*

Mitsubishi Galant VR-4 (1990 - 1993)
    -Required Adaptor: 5102
    -Plumb back hose required

Nissan 200SX SR20DET S14 – 15 (1994 – 2003)
    -Required Adaptor: 5109
    -Direct Bolt On
*The standard turbocharger on the 200SX (like the Skyline turbos) is prone to low rpm compressor surge. By replacing the factory BOV with a GFB unit, this tendency can be reduced, although compressor surge can still occur. However, as long as it only occurs at low rpm and boost levels then it isn't likely to cause turbo damage*

Nissan S13 Silvia & 180SX CA18DET
    *To fit a GFB blow-off valve to your Silvia or 180', weld a short section of steel pipe onto the intake between the intercooler and the throttle, onto which the BOV will secure*

Nissan S13 Silvia & 180SX SR20DET
    -Direct Bolt On

Nissan Skyline GTS-t R33 and GT-T R34
    -Required Adaptor: 5104
    -Direct Bolt On

* Note that there are two Hybrid options for the R33. The GT Hybrid is the better choice because it is actually a little cheaper than the universal Hybrid and adaptor combo, but if for example you already have the universal Hybrid and need to adapt it to the R33, then use the adaptor as indicated.

Nissan Skyline GT-R R32 (1989 – 1993)
    -Required Adaptor: 5104 and 5233
    -Direct Bolt On
*You will need two of these!*

Nissan Pulsar GTi-R N14 (1990 – 1994)
    -Direct Bolt On
*Important: the GTi-R's quad throttle bodies mean that the engine vacuum under idle and cruise conditions is less than almost any other car – proof that they really do reduce intake flow restriction! However, this means that to work sucessfully, any GFB BOV fitted to a GTi-R must first be fitted with a lighter spring – the one usually fitted to the GFB plumback BOV*

*For all other GFB BOVs, you will need to buy the softer spring (part #6116), or in some cases you can specify to your retailer that it's for a GTi-R when ordering your GFB blow-off valve. Without the softer spring, you'll find that the valve just won't open, and instead of a BOV "whoosh", you'll get a whole lot of turbo flutter*

N12 Pulsar ET (1984 – 1987)
   *Fitting a GFB BOV to your ET is simple, just weld a short section of steel pipe (aluminium and stainless steel also available) to the intake system somewhere between the turbo and the throttle, and after the intercooler if there's one fitted. The GFB BOV then secures onto this pipe. Connect up a vacuum lineto the BOVs vacuum nipple and you're done!*

Nissan Z32 300ZX Twin-turbo
    -Direct Bolt On

Subaru WRX MY94-96
    -Required Adaptor: 5020 and 5520
 *This particular model has a very small factory valve, using 19mm internal diameter hoses. The metal elbow fitting that feeds the factory BOV is even smaller through the bore, about 15mm. It is quite straightforward installing an atmosphere-venting valve, as the plumb back hose is simply plugged (using the 20mm 5520 plug) and the valve is fastened to the factory hose*

MY97-98 WRX and Version 3-4 STi
    -Direct Bolt On
*Blow-off valve installation on this model is very easy, the factory valve is hose mounted and secured with hose clamps. GFB units will fit straight back into the factory position*

Subaru Forester GT (MY98 - 00)
    -Required Adaptor: 5101
*Fitting a GFB blow-off valve to your Forester is simple. Using a GFB Forester GT/MY99-00 WRX flange mount adaptor, which bolts on in the factory BOV position on the intercooler*

Subaru Forester GT (MY01 - 02)
    -Required Adaptor: 5106
    -Direct Bolt On
*Fitting a GFB blow-off valve to your MY01 - 02 Forester GT is simple. Using a GFB Forester GT (MY01-02) flange mount base adaptor, which bolts on in the factory BOV position on the intercooler*

Subaru Forester XT (MY03 - 04)
    -Required Adaptor: 5107
    -Direct Bolt On
*Fitting a GFB blow-off valve to your Forester XT requires the use of a GFB Forester XT flange adaptor*

Toyota Celica GT4 ST205 (1994 – 1995)
    *fits in place of the factory unit requiring only minor modifications to the factory rubber hoses or a replacement hose. While it won't give you a measurable power increase, it will give you an improvement in throttle response that you can feel*

    *All of the GFB BOVs fit in place of the factory unit requiring only minor modifications to the factory rubber hoses or a replacement hose.*

Toyota Supra JZA80 2JZGTE
    *will require a custom installation using additional rubber hoses (available from any auto parts store)*

Volkswagen - All 1.8 Turbo models (1996 – Current)
    -Required Adaptor: 5025 and 5225
    -Direct Bolt On
1) On all VW turbo engines, the factory plastic Bosch diverter valve is installed in the reverse direction to conventional bypass valves, with boost pressure entering the side of the valve and dumping through the bottom. Therefore when installing a GFB valve, it must be installed in the REVERSE direction compared to the factory one (boost must enter the GFB unit through the bottom, and dump through the side). This is essential for the valve to operate properly. Incorrect orientation of a GFB valve will prevent the piston from opening.
2) Many of the 1.8T engines use crimped-on hose clamps on the factory diverter valves, which are not re-useable. New hose clamps are required for installation in such cases.

Additional Notes:

*Blow-off valves 1001 - 1005, 1008 and 1025 can be custom fitted by welding a short length of 1" steel pipe onto the inlet plumbing.

*A short section of weld-on pipe is supplied with BOVs 1001 - 5, and is available as optional part no. 5601 for others*