NOTE: 2.0L WRX engines will need the 2.5L STI oil pan install kit.
The PERRIN Big Tube Header is perfect for those of you looking to increase both horsepower and torque numbers. However because this header features 1.625” tubing, this makes for the perfect header for those employing a rotated setup looking to make more than 500 horsepower.
The E4 Series Big Tube Header comes with collectors that have been designed to f. . . Show More >