I was advised to get the boost controller and a Forge DV before my stage 2+ custom tune. Reason being the boost controller will hold boost much better and also prevent boost from spiking to dangerous level. As for the Forge DV, it is also to hold boost better compared to the oem DV. My ride is a S3 Sportsback running a hybrid K04, is the oem DV not good enough for stage 2+? Does a boost controller need a boost tap for install? A mate of mine with similar setup and tune has boost holding at 1.6 - 1.7 bar. Would like to hear some views here. Thanks.