PERRIN - Blow-Thru Boost Tube - Black (02-07 WRX / 04-07 STi)
   Quick Product Info
Brand: PERRIN Performance
Part #: F-PER-PSP-ITR-410BK
Color: Black
Compatibility: PERRIN FMIC (PSP-ENG-400) is installed
Finish: Powder Coated
Installation Hardware Included: Yes
Material: Aluminum
Mfgr. Warranty: 5 Years
   Confirmed Applications
2004-2007 Subaru STi
2002-2007 Subaru WRX
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Product Details

The Blow-Thru Boost Tube is intended for use on Subarus which are using aftermarket turbo chargers that can "outflow" the stock intake system. It replaces a PERRIN front mount intercooler boost tube with one that is larger and accepts the factory MAF sensor, relocating it from the intake system to the the boost tube, allowing the ECU to read more air flow, in turn allowing the tuner to tune beyond 450WHP!

Air leaks such as a disconnected vacuum hose or a loose or popped off boost tube are dangerous as they can cause severe engine damage or leave you stranded on the side of the road. The PERRIN Blow Thru boost tube moves the MAF sensor to only a short distance before the throttle body therefore allowing the ECU to compensate for any leaks in the system saving your engine.

The Blow-Thru Boost is designed with a larger pipe diameter right at the MAF housing. With proper tuning, this allows the ECU to read more air entering the engine without maxing out sensor voltage, allowing ECU mapping to 550WHP+. Tuners can start with maps built for the PERRIN BigMAF intake system, easily transitioning from short ram intake to Blow-Thru intercooler. This part does require ECU tuning and will not function correctly when installed on a stock tuned ECU.

Pro tuners now have the option of simply removing the Subaru intake and running a filter directly off the Turbo. No intake system is needed as the MAF sensor is now located within a boost tube.

VTA BOV Approved!
The BOV is normally located after the MAF sensor in the boost system. The Blow-Thru boost tube relocates the BOV fitting before the MAF sensor allowing drivers to use vent to atmosphere (VTA) blow off valves (BOV).