PERRIN Front Mount Intercooler users can now get a more accurate charge temperature reading and run a VTA BOV with no problems!  

Instead of measuring the Mass Air Flow (MAF) and air temperature before the turbocharger, the PERRIN PerformanceTM Blow-Thru boost tube moves the mass airflow sensor to the boost tube before the throttle body.  

The placement of this does many good things like allowing your ECU to read the actual charge temp the engine sees, which eliminates any need for a Cold air intake (MORE IN FEATURES).  Also use our Vent to Atmosphere (VTA) Blow off valve with out running rich between shifts, or with out idle problems. (see ASM-INT-600).

The Blow-Thru Boost Tube is a replacement of the large 2.75” tube in the PERRIN FMIC kit that relocates the MAF sensor into the boost tube. The way the MAF sensor works is very simple, and it doesn’t care, or know, if it is under boost or vacuum. This means the sensor can placed in the boost system, or in the intake system, and function normally.

Fits: Subaru STi 04-07 models using our PSP-ENG-400 Intercoolers produced after 6/2005

Includes: High Polish Finish or Signature Series Wrinkle Red powder-coated Aluminum Tube, Hardware and Instructions