As turbocharging becomes more popular in both factory and aftermarket applications, those of us familiar with naturally aspirated engines might not be fully up to speed on our turbo-plumbing anatomy.

If you're driving around in an STI, Evo or SR20-swapped 240, or perhaps you've thought about turbocharging your Civic or Z, you're going to want to invest in a good blowoff valve. The underlying ...