STM WRX/STi 2015-2020 Axle-Back to Cat-Back Upgrade Transmission Temp Gauge and allows for larger injectors

and allows for larger injectors to be added

It also serves as a oil cutter which eliminates friction loss and is recommended for anyone who wants to take their 4G63 to the next level

If you're putting this on an Evo 8/9

Outer Hose Diameter 1: 0

Suitable for many types of motorsport applications

STM WRX/STi 2015-2020 Axle-Back to Cat-Back Upgrade Transmission Temp Gauge and allows for larger injectorsIf you already purchased the STM Axle Back Exhaust, you can purchase the rest of the cat back system separately for a full upgrade! This *should* also be compatible with many other aftermarket axle backs that have a 2. 5" flange and bolts to the stock locations, but please confirm before purchase. The STM Stainless Steel Cat Back Dual Exit Exhaust for the 2015+ WRX and STi will bolt up to your stock or aftermarket downpipe and gives you everything you