PERRIN Gurney Flap - 2015-2021 WRX/STi Crank Pulley The STM Evo X stainless

The STM Evo X stainless steel catback dual exit exhaust will bolt up to your stock or aftermarket 3" cat or testpipe and give you the performance and flow you want

67" (OEM Size) 6

GVR4 and 1G/2G DSM

21mm Turbine Wheel Exducer

00 For the best all-around performance

PERRIN Gurney Flap - 2015-2021 WRX/STi Crank Pulley The STM Evo X stainlessVehicle Fitment: 2015 2021 WRX & STi INCREASE DOWNFORCE AND PERFORMANCE After sending the PERRIN Gurney Flap in for professional flow analysis, it was determined that it decreases overall lift of the car while only slightly increasing drag. This means the aerodynamic efficiency of the system is increased. Analysis has shown the PERRIN Gurney Flap increases downforce by 35 lbs. at 75 mph, 62 lbs. at 100 mph, and nearly 100 lbs. at 125 mph. AGGRESSIVE