GrimmSpeed Subaru Reverse Downpipe Adapter User Manual
GrimmSpeed For the car
GrimmSpeed Install Guide Series
Installing the GrimmSpeed Reverse Downpipe Adaptor
Introduction: This guide will illustrate the installation of the GrimmSpeed Reverse
Downpipe Adaptor. This adaptor will help you mate your stock downpipe to an
aftermarket 3in catback while still properly using the factory donut gasket.
Tools: The tools listed below are suggested for this task (figure 1). You will also
need wrenches for whatever hardware you’re currently using for the DP to Catback.
- 14mm socket or wrench
- 17mm socket of wrench
Tips: Clean gasket surfaces thoroughly to ensure a great seal!
1. Begin by collecting your tools safely raising your car.
2. With your downpipe and catback fully installed except for this junction,
assemble the gaskets and adaptor as shown below.
Factory Donut Gasket
GrimmSpeed 3in Gasket