Originally Posted by m3an
On a Maf car yes it may cause driveability problems when venting to atmosphere. On our cars this doesn't matter as they're is no Maf sensor expecting to read that air. You can either vent it or recirculate it back into the intake. Theres also nothing wrong with changing the bov flange to run a diff valve
This is true on this car since it's MAP based, the DME will detect the change in pressure when the valve vents and adjust fueling accordingly. But I still stand by my statement that the setup should stay the way it has been tested and designed. Reducing variables in a mix usually leads to more positive results. On a MAF based car it would cause all sorts of issues. EAS makes a good point about the venting on deceleration out of boost. It could get quite annoying, but since you're 6MT try and see if you like it. Personally I'm not a fan of non-intercooled setups, so I'd opt for the 600 kit.