Grimmspeed Stage 1 Power Package - 15-21 Subaru WRX- 191010 Green *Does NOT fit Civic Si

*Does NOT fit Civic Si or Type R or Hatchback

The GrimmSpeed Stage 1 Power Package is an excellent place to start when modifying your 2005-2009 Legacy GT

we saw typical peak and average gains of around 2-3hp with a much smoother power band

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

Grimmspeed Stage 1 Power Package - 15-21 Subaru WRX- 191010 Green *Does NOT fit Civic SiThe 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