We tune a lot of cars here at Jtune, and we don’t see any reason you should not run a blow-off valve of some sort. BOVs help a great deal with increasing the turbocharger’s longevity, but nowadays these new-generation ball-bearing turbos aren’t as essential for what people normally install them for — which is turbo lag between gear changes. The only issue we have with BOVs is when they are installed on a vehicle such as a Nissan Skyline, Subaru WRX, or the early Mitsubishis, which run airflow meters. Ventto-atmosphere BOVs have a huge affect on these vehicles; the most common are stalling problems at the lights, and running overly rich — often causing backfires and flames. There are a couple of methods to remedy this — the first is running an A’PEXi SAFC, which has a built-in function that can delay the airflow meter signal. By delaying the signal, the car won’t overfuel after dumping the air — and once you’re back on the throttle the ECU will have the correct amount of air and fuel. The second method is by using a BOV which is half vent-to-atmosphere, and half plumbback. This way, you get the sound and the performance. We recommend running the factory BOV plumbed back in, unless you’re running more boost, or you have deleted the airflow meter. We’ve found HKS, TiAL and GReddy items to be the most reliable — avoid replica items wherever possible.