Grimmspeed Stage 1 Power Package - 15-21 Subaru WRX- 191010 Green premium look in the engine

premium look in the engine bay and requires no modification to install

The GSS342 has an 11mm inlet in line with the outlet

AEM's Exhaust Backpressure install kit is specifically designed for use with AEM's 4-Channel Wideband UEGO Controller to provide accurate air/fuel ratio readings from wideband O2 sensors that are mounted pre-turbo

These are leak tested after installation from the factory and can be removed if not utilized

Clutch Disc: 3000905

Grimmspeed Stage 1 Power Package - 15-21 Subaru WRX- 191010 Green premium look in the engineThe beauty of the GrimmSpeed Staged Power Packages is that all of the included components were designed and tested to work well together as a complete system. Instead of piecing together parts from many different manufacturers and hoping that they're design theories are compatible, consider starting with one of our excellent Staged Power Packages based on your goals! The GrimmSpeed Stage 1 Power Package is an excellent place to start when modifying