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!
Now here's the cool part By turning the GFB world patented ratchet style head, you can finely adjust the amount of air that goes to each venting port, giving you complete control over how loud your gear changes are!