• RFL (Real Freaking Loud) blow off valve
• One of the loudest BOV options Turbo XS offers
• Rated for turbocharged engines running up to 35 PSI
• Mild steel and aluminum weld-on adapters included

If You Have to Ask How Loud It Is

Turbo XS doesn't hide what the RFL stands for: Real Freaking Loud, and it's genuinely one of the loudest blow off valve options in their entire lineup. This valve works fast to purge boost pressure on turbocharged vehicles, relieving compressor surge caused by changing gears or backing off the throttle, and it's rated for engines running up to 35 PSI of boost. If you want the loudest, most attention-grabbing BOV sound available, this is the one built for exactly that. It's a straightforward improvement that's easy to appreciate once it's installed.

Built for Serious Boost, Not Just Sound

Beyond the sound, this valve comes standard with both mild steel and aluminum weld-on adapters, giving you flexibility in how it's plumbed into your specific setup. Bolt-on kits are also available for most OEM turbocharged applications, making installation straightforward even without custom fabrication. It's a valve built to genuinely handle high-boost applications, not just make noise on a stock setup. That combination of durability and performance is what makes it worth the upgrade.

Straight From Subispeed

The loudest BOV option available for 2002-2007 Subaru WRX / 2004-2007 Subaru STI — genuinely rated for high-boost applications, not just for show.

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