The latest Smartstream 1.6 T-GDi engines fitted to Hyundai’s i20 N and other models do not use a MAF sensor which means that you can vent to atmosphere for that blow-off sound, if you like, without causing any driveability issues or ‘Check Engine’ lights. However, this Mach 2 valve is for those who want all the performance of the GFB TMS valve technology without any of the noise.
That said, Mach 2 gives you the freedom to fit an optional Atmospheric Venting Conversion kit at a later date to give you all the sound so you don’t need to buy a new valve.
Product Note: Only for models with Smartstream 1.6T-GDI engine (G4FP), NOT Gamma 1.6T-GDI (G4FJ). You can identify Smartstream models because they will have ‘Smartstream’ on the engine cover.  

Simply add an Atmospheric Conversion Kit for maximum noise (available separately).

All the Performance With or Without the Noise!
GFB’s Mach 2 utilises GFB’s proven TMS Technology to ensure rapid boost recovery on gearshift and optimum throttle response, as well as the ability to withstand boost pressures of 100psi+. Put simply, it can hold more boost than any turbo could produce.
With its single venting outlet, the Mach 2 is configured from the factory for full recirculation (i.e. plumb back, diverter, bypass) venting for the performance-minded who just want the benefits without the sound.

 
Complete Range of Fitment Options
The Mach 2 direct bolt-on range covers a huge list of popular vehicles. You can also purchase a variety of hose and flange adaptors for custom fitments.